129497875218 has 24 divisors (see below), whose sum is σ = 280593803100. Its totient is φ = 43163639424.

The previous prime is 129497875193. The next prime is 129497875237. The reversal of 129497875218 is 812578794921.

129497875218 is a `hidden beast` number, since 1 + 2 + 9 + 497 + 87 + 52 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 84979829169 + 44518046049 = 291513^2 + 210993^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169518 + ... + 536406.

Almost surely, 2^129497875218 is an apocalyptic number.

129497875218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129497875218 is an abundant number, since it is smaller than the sum of its proper divisors (151095927882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129497875218 is a wasteful number, since it uses less digits than its factorization.

129497875218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386506 (or 386503 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 129497875218 in words is "one hundred twenty-nine billion, four hundred ninety-seven million, eight hundred seventy-five thousand, two hundred eighteen".