656564889 has 8 divisors (see below), whose sum is σ = 899080000. Its totient is φ = 425879856.

The previous prime is 656564873. The next prime is 656564897. The reversal of 656564889 is 988465656.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656564889 - 2⁴ = 656564873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656564809) 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 7 ways as a sum of consecutive naturals, for example, 2957389 + ... + 2957610.

It is an arithmetic number, because the mean of its divisors is an integer number (112385000).

Almost surely, 2^656564889 is an apocalyptic number.

It is an amenable number.

656564889 is a deficient number, since it is larger than the sum of its proper divisors (242515111).

656564889 is a wasteful number, since it uses less digits than its factorization.

656564889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915039.

The product of its digits is 12441600, while the sum is 57.

The square root of 656564889 is about 25623.5221817766. The cubic root of 656564889 is about 869.1456310670.

The spelling of 656564889 in words is "six hundred fifty-six million, five hundred sixty-four thousand, eight hundred eighty-nine".