656910009 has 48 divisors (see below), whose sum is σ = 1158676480. Its totient is φ = 350269920.

The previous prime is 656909993. The next prime is 656910017. The reversal of 656910009 is 900019656.

It is not a de Polignac number, because 656910009 - 2⁴ = 656909993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656910109) 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 in 47 ways as a sum of consecutive naturals, for example, 76104 + ... + 84294.

Almost surely, 2^656910009 is an apocalyptic number.

It is an amenable number.

656910009 is a deficient number, since it is larger than the sum of its proper divisors (501766471).

656910009 is a wasteful number, since it uses less digits than its factorization.

656910009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8290 (or 8287 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 656910009 is about 25630.2557341904. The cubic root of 656910009 is about 869.2978917210.

The spelling of 656910009 in words is "six hundred fifty-six million, nine hundred ten thousand, nine".