796218920721 has 27 divisors (see below), whose sum is σ = 1337895931593. Its totient is φ = 454971532680.

The previous prime is 796218920713. The next prime is 796218920779. The reversal of 796218920721 is 127029812697.

The square root of 796218920721 is 892311.

It is a perfect power (a square), and thus also a powerful number.

796218920721 is a `hidden beast` number, since 7 + 9 + 621 + 8 + 9 + 2 + 0 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 796218920721 - 2³ = 796218920713 is a prime.

It is a super-2 number, since 2×796218920721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (796218920701) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18717286 + ... + 18759776.

Almost surely, 2^796218920721 is an apocalyptic number.

796218920721 is the 892311-st square number.

796218920721 is the 446156-th centered octagonal number.

It is an amenable number.

796218920721 is a deficient number, since it is larger than the sum of its proper divisors (541677010872).

796218920721 is an frugal number, since it uses more digits than its factorization.

796218920721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85002 (or 42501 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 796218920721 in words is "seven hundred ninety-six billion, two hundred eighteen million, nine hundred twenty thousand, seven hundred twenty-one".