521685021872 has 20 divisors (see below), whose sum is σ = 1155159691536. Its totient is φ = 223579295040.

The previous prime is 521685021829. The next prime is 521685021901. The reversal of 521685021872 is 278120586125.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2328950879 + ... + 2328951102.

Almost surely, 2^521685021872 is an apocalyptic number.

It is an amenable number.

521685021872 is an abundant number, since it is smaller than the sum of its proper divisors (633474669664).

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

521685021872 is a wasteful number, since it uses less digits than its factorization.

521685021872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4657901996 (or 4657901990 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 521685021872 in words is "five hundred twenty-one billion, six hundred eighty-five million, twenty-one thousand, eight hundred seventy-two".