79646664697 has 2 divisors, whose sum is σ = 79646664698. Its totient is φ = 79646664696.

The previous prime is 79646664659. The next prime is 79646664701.

79646664697 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73818716416 + 5827948281 = 271696^2 + 76341^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79646664697 is a prime.

It is a super-2 number, since 2×79646664697² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79646664637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39823332348 + 39823332349.

It is an arithmetic number, because the mean of its divisors is an integer number (39823332349).

Almost surely, 2^79646664697 is an apocalyptic number.

It is an amenable number.

79646664697 is a deficient number, since it is larger than the sum of its proper divisors (1).

79646664697 is an equidigital number, since it uses as much as digits as its factorization.

79646664697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493807104, while the sum is 70.

The spelling of 79646664697 in words is "seventy-nine billion, six hundred forty-six million, six hundred sixty-four thousand, six hundred ninety-seven".