521161798768 has 40 divisors (see below), whose sum is σ = 1122502349696. Its totient is φ = 232776979200.

The previous prime is 521161798741. The next prime is 521161798813. The reversal of 521161798768 is 867897161125.

It is a congruent number.

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, 40406223 + ... + 40419118.

Almost surely, 2^521161798768 is an apocalyptic number.

It is an amenable number.

521161798768 is an abundant number, since it is smaller than the sum of its proper divisors (601340550928).

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

521161798768 is a wasteful number, since it uses less digits than its factorization.

521161798768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80825393 (or 80825387 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 61.

The spelling of 521161798768 in words is "five hundred twenty-one billion, one hundred sixty-one million, seven hundred ninety-eight thousand, seven hundred sixty-eight".