79731613669 has 2 divisors, whose sum is σ = 79731613670. Its totient is φ = 79731613668.

The previous prime is 79731613651. The next prime is 79731613721. The reversal of 79731613669 is 96631613797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78211393569 + 1520220100 = 279663^2 + 38990^2 .

It is a cyclic number.

It is not a de Polignac number, because 79731613669 - 2³¹ = 77584130021 is a prime.

It is a super-2 number, since 2×79731613669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79731623669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39865806834 + 39865806835.

It is an arithmetic number, because the mean of its divisors is an integer number (39865806835).

Almost surely, 2^79731613669 is an apocalyptic number.

It is an amenable number.

79731613669 is a deficient number, since it is larger than the sum of its proper divisors (1).

79731613669 is an equidigital number, since it uses as much as digits as its factorization.

79731613669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 58.

The spelling of 79731613669 in words is "seventy-nine billion, seven hundred thirty-one million, six hundred thirteen thousand, six hundred sixty-nine".