656707897 has 4 divisors (see below), whose sum is σ = 665957376. Its totient is φ = 647458420.

The previous prime is 656707879. The next prime is 656707957. The reversal of 656707897 is 798707656.

656707897 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656707897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656207897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4624633 + ... + 4624774.

It is an arithmetic number, because the mean of its divisors is an integer number (166489344).

Almost surely, 2^656707897 is an apocalyptic number.

It is an amenable number.

656707897 is a deficient number, since it is larger than the sum of its proper divisors (9249479).

656707897 is an equidigital number, since it uses as much as digits as its factorization.

656707897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9249478.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The square root of 656707897 is about 25626.3125907728. The cubic root of 656707897 is about 869.2087300626.

The spelling of 656707897 in words is "six hundred fifty-six million, seven hundred seven thousand, eight hundred ninety-seven".