656656897 has 4 divisors (see below), whose sum is σ = 707168980. Its totient is φ = 606144816.

The previous prime is 656656873. The next prime is 656656921. The reversal of 656656897 is 798656656.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (656656873) and next prime (656656921).

It can be written as a sum of positive squares in 2 ways, for example, as 304118721 + 352538176 = 17439^2 + 18776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656656897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656656837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25256022 + ... + 25256047.

It is an arithmetic number, because the mean of its divisors is an integer number (176792245).

Almost surely, 2^656656897 is an apocalyptic number.

It is an amenable number.

656656897 is a deficient number, since it is larger than the sum of its proper divisors (50512083).

656656897 is a wasteful number, since it uses less digits than its factorization.

656656897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50512082.

The product of its digits is 16329600, while the sum is 58.

The square root of 656656897 is about 25625.3175004721. The cubic root of 656656897 is about 869.1862285349.

The spelling of 656656897 in words is "six hundred fifty-six million, six hundred fifty-six thousand, eight hundred ninety-seven".