79646815993 has 2 divisors, whose sum is σ = 79646815994. Its totient is φ = 79646815992.

The previous prime is 79646815973. The next prime is 79646816063. The reversal of 79646815993 is 39951864697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46547199504 + 33099616489 = 215748^2 + 181933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79646815993 is a prime.

It is not a weakly prime, because it can be changed into another prime (79646815933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39823407996 + 39823407997.

It is an arithmetic number, because the mean of its divisors is an integer number (39823407997).

Almost surely, 2^79646815993 is an apocalyptic number.

It is an amenable number.

79646815993 is a deficient number, since it is larger than the sum of its proper divisors (1).

79646815993 is an equidigital number, since it uses as much as digits as its factorization.

79646815993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88179840, while the sum is 67.

The spelling of 79646815993 in words is "seventy-nine billion, six hundred forty-six million, eight hundred fifteen thousand, nine hundred ninety-three".