79964420791 has 2 divisors, whose sum is σ = 79964420792. Its totient is φ = 79964420790.

The previous prime is 79964420779. The next prime is 79964420801. The reversal of 79964420791 is 19702446997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79964420791 - 2⁵ = 79964420759 is a prime.

It is a super-2 number, since 2×79964420791² (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 (79964424791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39982210395 + 39982210396.

It is an arithmetic number, because the mean of its divisors is an integer number (39982210396).

Almost surely, 2^79964420791 is an apocalyptic number.

79964420791 is a deficient number, since it is larger than the sum of its proper divisors (1).

79964420791 is an equidigital number, since it uses as much as digits as its factorization.

79964420791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 79964420791 in words is "seventy-nine billion, nine hundred sixty-four million, four hundred twenty thousand, seven hundred ninety-one".