79663613 has 2 divisors, whose sum is σ = 79663614. Its totient is φ = 79663612.

The previous prime is 79663601. The next prime is 79663663. The reversal of 79663613 is 31636697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77915929 + 1747684 = 8827^2 + 1322^2 .

It is an emirp because it is prime and its reverse (31636697) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79663613 - 2⁸ = 79663357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79663663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39831806 + 39831807.

It is an arithmetic number, because the mean of its divisors is an integer number (39831807).

Almost surely, 2^79663613 is an apocalyptic number.

It is an amenable number.

79663613 is a deficient number, since it is larger than the sum of its proper divisors (1).

79663613 is an equidigital number, since it uses as much as digits as its factorization.

79663613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 41.

The square root of 79663613 is about 8925.4474957842. The cubic root of 79663613 is about 430.2821530200.

The spelling of 79663613 in words is "seventy-nine million, six hundred sixty-three thousand, six hundred thirteen".