79646815757 has 2 divisors, whose sum is σ = 79646815758. Its totient is φ = 79646815756.

The previous prime is 79646815733. The next prime is 79646815769. The reversal of 79646815757 is 75751864697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77414158756 + 2232657001 = 278234^2 + 47251^2 .

It is a cyclic number.

It is not a de Polignac number, because 79646815757 - 2⁶ = 79646815693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79646815693 and 79646815702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79646815057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39823407878 + 39823407879.

It is an arithmetic number, because the mean of its divisors is an integer number (39823407879).

Almost surely, 2^79646815757 is an apocalyptic number.

It is an amenable number.

79646815757 is a deficient number, since it is larger than the sum of its proper divisors (1).

79646815757 is an equidigital number, since it uses as much as digits as its factorization.

79646815757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88905600, while the sum is 65.

The spelling of 79646815757 in words is "seventy-nine billion, six hundred forty-six million, eight hundred fifteen thousand, seven hundred fifty-seven".