79942576169 has 2 divisors, whose sum is σ = 79942576170. Its totient is φ = 79942576168.

The previous prime is 79942576157. The next prime is 79942576261. The reversal of 79942576169 is 96167524997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57092323600 + 22850252569 = 238940^2 + 151163^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79942576169 is a prime.

It is a super-2 number, since 2×79942576169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79942576139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39971288084 + 39971288085.

It is an arithmetic number, because the mean of its divisors is an integer number (39971288085).

Almost surely, 2^79942576169 is an apocalyptic number.

It is an amenable number.

79942576169 is a deficient number, since it is larger than the sum of its proper divisors (1).

79942576169 is an equidigital number, since it uses as much as digits as its factorization.

79942576169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51438240, while the sum is 65.

The spelling of 79942576169 in words is "seventy-nine billion, nine hundred forty-two million, five hundred seventy-six thousand, one hundred sixty-nine".