129785775732 has 72 divisors (see below), whose sum is σ = 347454676296. Its totient is φ = 40706924544.

The previous prime is 129785775683. The next prime is 129785775751. The reversal of 129785775732 is 237577587921.

It is a happy number.

129785775732 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 8 + 57 + 7 + 573 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 42043041936 + 87742733796 = 205044^2 + 296214^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129785775732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2642148 + ... + 2690820.

It is an arithmetic number, because the mean of its divisors is an integer number (4825759393).

Almost surely, 2^129785775732 is an apocalyptic number.

129785775732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129785775732 is an abundant number, since it is smaller than the sum of its proper divisors (217668900564).

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

129785775732 is a wasteful number, since it uses less digits than its factorization.

129785775732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53057 (or 53052 counting only the distinct ones).

The product of its digits is 51861600, while the sum is 63.

The spelling of 129785775732 in words is "one hundred twenty-nine billion, seven hundred eighty-five million, seven hundred seventy-five thousand, seven hundred thirty-two".