79995573721 has 64 divisors (see below), whose sum is σ = 98442496000. Its totient is φ = 64908200448.

The previous prime is 79995573709. The next prime is 79995573739. The reversal of 79995573721 is 12737559997.

It is not a de Polignac number, because 79995573721 - 2¹⁵ = 79995540953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79995573761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73188451 + ... + 73189543.

It is an arithmetic number, because the mean of its divisors is an integer number (1538164000).

Almost surely, 2^79995573721 is an apocalyptic number.

It is an amenable number.

79995573721 is a deficient number, since it is larger than the sum of its proper divisors (18446922279).

79995573721 is a wasteful number, since it uses less digits than its factorization.

79995573721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303 (or 1289 counting only the distinct ones).

The product of its digits is 37507050, while the sum is 64.

The spelling of 79995573721 in words is "seventy-nine billion, nine hundred ninety-five million, five hundred seventy-three thousand, seven hundred twenty-one".