129927958656 has 64 divisors (see below), whose sum is σ = 348998997600. Its totient is φ = 42822686720.

The previous prime is 129927958639. The next prime is 129927958697. The reversal of 129927958656 is 656859729921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1866690 + ... + 1935041.

Almost surely, 2^129927958656 is an apocalyptic number.

129927958656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129927958656 is an abundant number, since it is smaller than the sum of its proper divisors (219071038944).

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

129927958656 is an equidigital number, since it uses as much as digits as its factorization.

129927958656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801837 (or 3801825 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 69.

The spelling of 129927958656 in words is "one hundred twenty-nine billion, nine hundred twenty-seven million, nine hundred fifty-eight thousand, six hundred fifty-six".