79904040476797 has 2 divisors, whose sum is σ = 79904040476798. Its totient is φ = 79904040476796.

The previous prime is 79904040476789. The next prime is 79904040476873. The reversal of 79904040476797 is 79767404040997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62148090160836 + 17755950315961 = 7883406^2 + 4213781^2 .

It is a cyclic number.

It is not a de Polignac number, because 79904040476797 - 2³ = 79904040476789 is a prime.

It is a super-2 number, since 2×79904040476797² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79904040476747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39952020238398 + 39952020238399.

It is an arithmetic number, because the mean of its divisors is an integer number (39952020238399).

Almost surely, 2^{79904040476797} is an apocalyptic number.

It is an amenable number.

79904040476797 is a deficient number, since it is larger than the sum of its proper divisors (1).

79904040476797 is an equidigital number, since it uses as much as digits as its factorization.

79904040476797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672126336, while the sum is 73.

The spelling of 79904040476797 in words is "seventy-nine trillion, nine hundred four billion, forty million, four hundred seventy-six thousand, seven hundred ninety-seven".