79663817 has 2 divisors, whose sum is σ = 79663818. Its totient is φ = 79663816.

The previous prime is 79663813. The next prime is 79663847. The reversal of 79663817 is 71836697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69288976 + 10374841 = 8324^2 + 3221^2 .

It is a cyclic number.

It is not a de Polignac number, because 79663817 - 2² = 79663813 is a prime.

It is not a weakly prime, because it can be changed into another prime (79663813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39831908 + 39831909.

It is an arithmetic number, because the mean of its divisors is an integer number (39831909).

Almost surely, 2^79663817 is an apocalyptic number.

It is an amenable number.

79663817 is a deficient number, since it is larger than the sum of its proper divisors (1).

79663817 is an equidigital number, since it uses as much as digits as its factorization.

79663817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 79663817 is about 8925.4589237753. The cubic root of 79663817 is about 430.2825203039.

The spelling of 79663817 in words is "seventy-nine million, six hundred sixty-three thousand, eight hundred seventeen".