79813021216 has 24 divisors (see below), whose sum is σ = 157336266780. Its totient is φ = 39854604288.

The previous prime is 79813021201. The next prime is 79813021219. The reversal of 79813021216 is 61212031897.

It can be written as a sum of positive squares in 2 ways, for example, as 79354890000 + 458131216 = 281700^2 + 21404^2 .

It is a super-2 number, since 2×79813021216² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79813021219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597081 + ... + 1646296.

Almost surely, 2^79813021216 is an apocalyptic number.

It is an amenable number.

79813021216 is a deficient number, since it is larger than the sum of its proper divisors (77523245564).

79813021216 is a wasteful number, since it uses less digits than its factorization.

79813021216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244156 (or 3244148 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 79813021216 in words is "seventy-nine billion, eight hundred thirteen million, twenty-one thousand, two hundred sixteen".