91357445657 has 2 divisors, whose sum is σ = 91357445658. Its totient is φ = 91357445656.

The previous prime is 91357445651. The next prime is 91357445659. The reversal of 91357445657 is 75654475319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74793498256 + 16563947401 = 273484^2 + 128701^2 .

It is a cyclic number.

It is not a de Polignac number, because 91357445657 - 2⁶ = 91357445593 is a prime.

Together with 91357445659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91357445651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45678722828 + 45678722829.

It is an arithmetic number, because the mean of its divisors is an integer number (45678722829).

Almost surely, 2^91357445657 is an apocalyptic number.

It is an amenable number.

91357445657 is a deficient number, since it is larger than the sum of its proper divisors (1).

91357445657 is an equidigital number, since it uses as much as digits as its factorization.

91357445657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876000, while the sum is 56.

The spelling of 91357445657 in words is "ninety-one billion, three hundred fifty-seven million, four hundred forty-five thousand, six hundred fifty-seven".