79721590051 has 16 divisors (see below), whose sum is σ = 80579266560. Its totient is φ = 78869689920.

The previous prime is 79721590043. The next prime is 79721590057. The reversal of 79721590051 is 15009512797.

It is a cyclic number.

It is not a de Polignac number, because 79721590051 - 2³ = 79721590043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79721589983 and 79721590010.

It is not an unprimeable number, because it can be changed into a prime (79721590057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42426730 + ... + 42428608.

It is an arithmetic number, because the mean of its divisors is an integer number (5036204160).

Almost surely, 2^79721590051 is an apocalyptic number.

79721590051 is a deficient number, since it is larger than the sum of its proper divisors (857676509).

79721590051 is a wasteful number, since it uses less digits than its factorization.

79721590051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186.

The product of its (nonzero) digits is 198450, while the sum is 46.

The spelling of 79721590051 in words is "seventy-nine billion, seven hundred twenty-one million, five hundred ninety thousand, fifty-one".