79216564623761 has 2 divisors, whose sum is σ = 79216564623762. Its totient is φ = 79216564623760.

The previous prime is 79216564623751. The next prime is 79216564623821. The reversal of 79216564623761 is 16732646561297.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56666944785025 + 22549619838736 = 7527745^2 + 4748644^2 .

It is a cyclic number.

It is not a de Polignac number, because 79216564623761 - 2¹⁸ = 79216564361617 is a prime.

It is a super-2 number, since 2×79216564623761² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79216564623751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39608282311880 + 39608282311881.

It is an arithmetic number, because the mean of its divisors is an integer number (39608282311881).

Almost surely, 2^{79216564623761} is an apocalyptic number.

It is an amenable number.

79216564623761 is a deficient number, since it is larger than the sum of its proper divisors (1).

79216564623761 is an equidigital number, since it uses as much as digits as its factorization.

79216564623761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137168640, while the sum is 65.

The spelling of 79216564623761 in words is "seventy-nine trillion, two hundred sixteen billion, five hundred sixty-four million, six hundred twenty-three thousand, seven hundred sixty-one".