129640556511 has 16 divisors (see below), whose sum is σ = 196146470400. Its totient is φ = 84588163704.

The previous prime is 129640556497. The next prime is 129640556519. The reversal of 129640556511 is 115655046921.

129640556511 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 40 + 556 + 51 + 1 = 666.

It is not a de Polignac number, because 129640556511 - 2²⁵ = 129607002079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129640556519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51078541 + ... + 51081078.

It is an arithmetic number, because the mean of its divisors is an integer number (12259154400).

Almost surely, 2^129640556511 is an apocalyptic number.

129640556511 is a deficient number, since it is larger than the sum of its proper divisors (66505913889).

129640556511 is a wasteful number, since it uses less digits than its factorization.

129640556511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102159675 (or 102159669 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 129640556511 in words is "one hundred twenty-nine billion, six hundred forty million, five hundred fifty-six thousand, five hundred eleven".