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129999999999999 = 3971572845448377
BaseRepresentation
bin11101100011101111111011…
…110100100001111111111111
3122001021212201112000021202210
4131203233323310201333333
5114014404444444444444
61140253101525551503
736245122121541453
oct3543577364417777
9561255645007683
10129999999999999
11384707659a8228
12126b6a54b75593
13576cc4158519c
14241606819c663
1510068e95987b9
hex763bfbd21fff

129999999999999 has 16 divisors (see below), whose sum is σ = 176235690739808. Its totient is φ = 85226869757952.

The previous prime is 129999999999973. The next prime is 130000000000063. The reversal of 129999999999999 is 999999999999921.

It is not a de Polignac number, because 129999999999999 - 228 = 129999731564543 is a prime.

It is a super-9 number, since 9×1299999999999999 (a number of 128 digits) contains 999999999 as substring.

It is a Duffinian number.

129999999999999 is a modest number, since divided by 99999999 gives 1299999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129999999999799) by changing a digit.

Being equal to 13×1013-1, it is a generalized Woodall number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1422678502 + ... + 1422769875.

It is an arithmetic number, because the mean of its divisors is an integer number (11014730671238).

Almost surely, 2129999999999999 is an apocalyptic number.

129999999999999 is a deficient number, since it is larger than the sum of its proper divisors (46235690739809).

129999999999999 is a wasteful number, since it uses less digits than its factorization.

129999999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845448634.

The product of its digits is 5083731656658, while the sum is 120.

The spelling of 129999999999999 in words is "one hundred twenty-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".