129730931856 has 80 divisors (see below), whose sum is σ = 372552405120. Its totient is φ = 43223137920.

The previous prime is 129730931849. The next prime is 129730931857. The reversal of 129730931856 is 658139037921.

129730931856 is a `hidden beast` number, since 1 + 297 + 30 + 9 + 318 + 5 + 6 = 666.

It is a super-2 number, since 2×129730931856² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (129730931857) 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, 854781 + ... + 995043.

It is an arithmetic number, because the mean of its divisors is an integer number (4656905064).

Almost surely, 2^129730931856 is an apocalyptic number.

129730931856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129730931856 is an abundant number, since it is smaller than the sum of its proper divisors (242821473264).

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

129730931856 is a wasteful number, since it uses less digits than its factorization.

129730931856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142421 (or 142409 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 129730931856 in words is "one hundred twenty-nine billion, seven hundred thirty million, nine hundred thirty-one thousand, eight hundred fifty-six".