129177910656 has 192 divisors, whose sum is σ = 384440284800. Its totient is φ = 41591439360.

The previous prime is 129177910649. The next prime is 129177910661. The reversal of 129177910656 is 656019771921.

It is a tau number, because it is divible by the number of its divisors (192).

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, 20602690 + ... + 20608958.

It is an arithmetic number, because the mean of its divisors is an integer number (2002293150).

Almost surely, 2^129177910656 is an apocalyptic number.

129177910656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129177910656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192220142400).

129177910656 is an abundant number, since it is smaller than the sum of its proper divisors (255262374144).

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

129177910656 is a wasteful number, since it uses less digits than its factorization.

129177910656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6897 (or 6882 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The spelling of 129177910656 in words is "one hundred twenty-nine billion, one hundred seventy-seven million, nine hundred ten thousand, six hundred fifty-six".