129289521256 has 32 divisors (see below), whose sum is σ = 278027979840. Its totient is φ = 55213993728.

The previous prime is 129289521241. The next prime is 129289521271. The reversal of 129289521256 is 652125982921.

It is an interprime number because it is at equal distance from previous prime (129289521241) and next prime (129289521271).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4063201 + ... + 4094896.

It is an arithmetic number, because the mean of its divisors is an integer number (8688374370).

Almost surely, 2^129289521256 is an apocalyptic number.

It is an amenable number.

129289521256 is an abundant number, since it is smaller than the sum of its proper divisors (148738458584).

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

129289521256 is a wasteful number, since it uses less digits than its factorization.

129289521256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8158393 (or 8158389 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 52.

The spelling of 129289521256 in words is "one hundred twenty-nine billion, two hundred eighty-nine million, five hundred twenty-one thousand, two hundred fifty-six".