13891168657 has 2 divisors, whose sum is σ = 13891168658. Its totient is φ = 13891168656.

The previous prime is 13891168637. The next prime is 13891168691. The reversal of 13891168657 is 75686119831.

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., 13484783376 + 406385281 = 116124^2 + 20159^2 .

It is a cyclic number.

It is not a de Polignac number, because 13891168657 - 2²³ = 13882780049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13891168598 and 13891168607.

It is not a weakly prime, because it can be changed into another prime (13891168637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945584328 + 6945584329.

It is an arithmetic number, because the mean of its divisors is an integer number (6945584329).

Almost surely, 2^13891168657 is an apocalyptic number.

It is an amenable number.

13891168657 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891168657 is an equidigital number, since it uses as much as digits as its factorization.

13891168657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

The spelling of 13891168657 in words is "thirteen billion, eight hundred ninety-one million, one hundred sixty-eight thousand, six hundred fifty-seven".