79157388389 has 2 divisors, whose sum is σ = 79157388390. Its totient is φ = 79157388388.

The previous prime is 79157388361. The next prime is 79157388481. The reversal of 79157388389 is 98388375197.

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., 79063879489 + 93508900 = 281183^2 + 9670^2 .

It is a cyclic number.

It is not a de Polignac number, because 79157388389 - 2²⁰ = 79156339813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79157388329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39578694194 + 39578694195.

It is an arithmetic number, because the mean of its divisors is an integer number (39578694195).

Almost surely, 2^79157388389 is an apocalyptic number.

It is an amenable number.

79157388389 is a deficient number, since it is larger than the sum of its proper divisors (1).

79157388389 is an equidigital number, since it uses as much as digits as its factorization.

79157388389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 68.

The spelling of 79157388389 in words is "seventy-nine billion, one hundred fifty-seven million, three hundred eighty-eight thousand, three hundred eighty-nine".