657922961 has 2 divisors, whose sum is σ = 657922962. Its totient is φ = 657922960.

The previous prime is 657922949. The next prime is 657922997. The reversal of 657922961 is 169229756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620956561 + 36966400 = 24919^2 + 6080^2 .

It is a cyclic number.

It is not a de Polignac number, because 657922961 - 2⁶ = 657922897 is a prime.

It is a super-2 number, since 2×657922961² = 865725245222015042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (657922901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328961480 + 328961481.

It is an arithmetic number, because the mean of its divisors is an integer number (328961481).

Almost surely, 2^657922961 is an apocalyptic number.

It is an amenable number.

657922961 is a deficient number, since it is larger than the sum of its proper divisors (1).

657922961 is an equidigital number, since it uses as much as digits as its factorization.

657922961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 657922961 is about 25650.0089863532. The cubic root of 657922961 is about 869.7444799438.

The spelling of 657922961 in words is "six hundred fifty-seven million, nine hundred twenty-two thousand, nine hundred sixty-one".