656177897 has 2 divisors, whose sum is σ = 656177898. Its totient is φ = 656177896.

The previous prime is 656177891. The next prime is 656177957. The reversal of 656177897 is 798771656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553378576 + 102799321 = 23524^2 + 10139^2 .

It is a cyclic number.

It is not a de Polignac number, because 656177897 - 2¹⁸ = 655915753 is a prime.

It is a super-2 number, since 2×656177897² = 861138865022685218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656177891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328088948 + 328088949.

It is an arithmetic number, because the mean of its divisors is an integer number (328088949).

Almost surely, 2^656177897 is an apocalyptic number.

It is an amenable number.

656177897 is a deficient number, since it is larger than the sum of its proper divisors (1).

656177897 is an equidigital number, since it uses as much as digits as its factorization.

656177897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 56.

The square root of 656177897 is about 25615.9695697821. The cubic root of 656177897 is about 868.9748337767.

The spelling of 656177897 in words is "six hundred fifty-six million, one hundred seventy-seven thousand, eight hundred ninety-seven".