656880997 has 2 divisors, whose sum is σ = 656880998. Its totient is φ = 656880996.

The previous prime is 656880947. The next prime is 656881009. The reversal of 656880997 is 799088656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344510721 + 312370276 = 18561^2 + 17674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656880997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656880947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328440498 + 328440499.

It is an arithmetic number, because the mean of its divisors is an integer number (328440499).

Almost surely, 2^656880997 is an apocalyptic number.

It is an amenable number.

656880997 is a deficient number, since it is larger than the sum of its proper divisors (1).

656880997 is an equidigital number, since it uses as much as digits as its factorization.

656880997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The square root of 656880997 is about 25629.6897562183. The cubic root of 656880997 is about 869.2850942087.

The spelling of 656880997 in words is "six hundred fifty-six million, eight hundred eighty thousand, nine hundred ninety-seven".