521720025512 has 32 divisors (see below), whose sum is σ = 1118061316800. Its totient is φ = 223576329984.

The previous prime is 521720025499. The next prime is 521720025521. The reversal of 521720025512 is 215520027125.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340928 + ... + 1076880.

It is an arithmetic number, because the mean of its divisors is an integer number (34939416150).

Almost surely, 2^521720025512 is an apocalyptic number.

It is an amenable number.

521720025512 is an abundant number, since it is smaller than the sum of its proper divisors (596341291288).

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

521720025512 is a wasteful number, since it uses less digits than its factorization.

521720025512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748625 (or 748621 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 32.

The spelling of 521720025512 in words is "five hundred twenty-one billion, seven hundred twenty million, twenty-five thousand, five hundred twelve".