79564459969 has 2 divisors, whose sum is σ = 79564459970. Its totient is φ = 79564459968.

The previous prime is 79564459939. The next prime is 79564459979. The reversal of 79564459969 is 96995446597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61484161600 + 18080298369 = 247960^2 + 134463^2 .

It is a cyclic number.

It is not a de Polignac number, because 79564459969 - 2⁷ = 79564459841 is a prime.

It is a super-2 number, since 2×79564459969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79564459939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39782229984 + 39782229985.

It is an arithmetic number, because the mean of its divisors is an integer number (39782229985).

Almost surely, 2^79564459969 is an apocalyptic number.

It is an amenable number.

79564459969 is a deficient number, since it is larger than the sum of its proper divisors (1).

79564459969 is an equidigital number, since it uses as much as digits as its factorization.

79564459969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 661348800, while the sum is 73.

The spelling of 79564459969 in words is "seventy-nine billion, five hundred sixty-four million, four hundred fifty-nine thousand, nine hundred sixty-nine".