657464641 has 2 divisors, whose sum is σ = 657464642. Its totient is φ = 657464640.

The previous prime is 657464609. The next prime is 657464659. The reversal of 657464641 is 146464756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533610000 + 123854641 = 23100^2 + 11129^2 .

It is a cyclic number.

It is not a de Polignac number, because 657464641 - 2⁵ = 657464609 is a prime.

It is not a weakly prime, because it can be changed into another prime (657464741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328732320 + 328732321.

It is an arithmetic number, because the mean of its divisors is an integer number (328732321).

Almost surely, 2^657464641 is an apocalyptic number.

It is an amenable number.

657464641 is a deficient number, since it is larger than the sum of its proper divisors (1).

657464641 is an equidigital number, since it uses as much as digits as its factorization.

657464641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 43.

The square root of 657464641 is about 25641.0733199685. The cubic root of 657464641 is about 869.5424735735.

The spelling of 657464641 in words is "six hundred fifty-seven million, four hundred sixty-four thousand, six hundred forty-one".