79965643 has 2 divisors, whose sum is σ = 79965644. Its totient is φ = 79965642.

The previous prime is 79965631. The next prime is 79965653. The reversal of 79965643 is 34656997.

It is a strong prime.

It is an emirp because it is prime and its reverse (34656997) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79965643 is a prime.

It is not a weakly prime, because it can be changed into another prime (79965653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39982821 + 39982822.

It is an arithmetic number, because the mean of its divisors is an integer number (39982822).

Almost surely, 2^79965643 is an apocalyptic number.

79965643 is a deficient number, since it is larger than the sum of its proper divisors (1).

79965643 is an equidigital number, since it uses as much as digits as its factorization.

79965643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 79965643 is about 8942.3510890593. The cubic root of 79965643 is about 430.8252459135.

It can be divided in two parts, 79965 and 643, that added together give a palindrome (80608).

The spelling of 79965643 in words is "seventy-nine million, nine hundred sixty-five thousand, six hundred forty-three".