highly composite number, smallest number divisible by all the numbers 1 through 24 5,489,031,744 = 740882 = 17643 = 426 5,555,555,555 = repdigit 5,584,059,449 = 895 5,784,634,181 = 13th alternating factorial. 5,904,900,000 = 905 6,000,000,000 to 6,999,999,999 6,103,515,625 = 781252 = 257 = 514 6,104,053,449 = Leyland number 6,210,001,000 = only self-descriptive number in base 10. 6,227,020,800 = 13! 6,240,321,451 = 915 6,321,363,049 = 795072 = 18493 = 436 6,469,693,230 = tenth primorial 6,590,815,232 = 925 6,659,914,175 = number of (unordered, unlabeled) rooted trimmed trees with 30 nodes 6,666,666,666 = repdigit 6,956,883,693 = 935 6,975,757,441 = 835212 = 2894 = 178 6,983,776,800 = 15th colossally abundant number, 15th superior highly composite number 7,000,000,000 to 7,999,999,999 7,007,009,909 = smallest number in base 10 to take 100 iterations to form a palindrome 7,256,313,856 = 851842 = 19363 = 446 7,339,040,224 = 945 7,371,308,068 = number of partitions of 252 into divisors of 252 7,391,026,522 = number of planar partitions of 49 7,464,000,000 = Estimated population of the Earth in 2016 according to Worldometers 7,544,428,973 = number of uniform rooted trees with 28 nodes 7,645,370,045 = 27th Pell number. 7,737,809,375 = 955 7,777,777,777 = repdigit 7,778,742,049 = 49th Fibonacci number. 7,795,000,000 = Estimated population of the Earth in 2020 according to Worldometers 7,862,958,391 = 32nd Wedderburn–Etherington number. 8,000,000,000 to 8,999,999,999 8,031,810,176 = 267 8,153,726,976 = 965 8,212,890,625 = 1-automorphic number 8,303,765,625 = 911252 = 20253 = 456 8,549,176,320 = pandigital number with the digits arranged in alphabetical order by English name 8,587,340,257 = 975 8,589,866,963 = number of subsets of {1,2,...,33} with relatively prime elements 8,589,869,056 = 6th perfect number. 8,589,934,592 = 20483 = 811 = 233 8,589,935,681 = Leyland prime 8,622,571,758 = number of secondary structures of RNA molecules with 29 nucleotides 8,804,293,473 = Leyland number 8,888,888,888 = repdigit 9,000,000,000 to 9,999,999,999 9,039,207,968 = 985 9,043,402,501 = 25th Motzkin number. 9,393,931,000 = 21103 9,474,296,896 = 973362 = 21163 = 466 9,509,900,499 = 995 9,814,072,356 = 990662, the largest pandigital square, largest pandigital pure power. 9,876,543,210 = largest number without repeated digits in base 10. 9,999,800,001 = 999992, the largest ten-digit square. 9,999,999,967 = greatest prime number with 10 digits 9,999,999,999 = largest 10-digit number, repdigit References Integers Large numbers