129975385968 has 80 divisors (see below), whose sum is σ = 381015375360. Its totient is φ = 42403310784.

The previous prime is 129975385927. The next prime is 129975385979. The reversal of 129975385968 is 869583579921.

129975385968 is a `hidden beast` number, since 1 + 2 + 99 + 75 + 385 + 96 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 129975385896 and 129975385905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3180430 + ... + 3221037.

It is an arithmetic number, because the mean of its divisors is an integer number (4762692192).

Almost surely, 2^129975385968 is an apocalyptic number.

129975385968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129975385968 is an abundant number, since it is smaller than the sum of its proper divisors (251039989392).

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

129975385968 is a wasteful number, since it uses less digits than its factorization.

129975385968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6401531 (or 6401519 counting only the distinct ones).

The product of its digits is 293932800, while the sum is 72.

The spelling of 129975385968 in words is "one hundred twenty-nine billion, nine hundred seventy-five million, three hundred eighty-five thousand, nine hundred sixty-eight".