521879798360816 has 80 divisors (see below), whose sum is σ = 1246080134933760. Its totient is φ = 206722971624960.

The previous prime is 521879798360731. The next prime is 521879798360821. The reversal of 521879798360816 is 618063897978125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2990696486 + ... + 2990870981.

It is an arithmetic number, because the mean of its divisors is an integer number (15576001686672).

Almost surely, 2^{521879798360816} is an apocalyptic number.

521879798360816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

521879798360816 is an abundant number, since it is smaller than the sum of its proper divisors (724200336572944).

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

521879798360816 is a wasteful number, since it uses less digits than its factorization.

521879798360816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5981567542 (or 5981567536 counting only the distinct ones).

The product of its (nonzero) digits is 2194698240, while the sum is 80.

The spelling of 521879798360816 in words is "five hundred twenty-one trillion, eight hundred seventy-nine billion, seven hundred ninety-eight million, three hundred sixty thousand, eight hundred sixteen".