656666634 has 16 divisors (see below), whose sum is σ = 1414359072. Its totient is φ = 202051248.

The previous prime is 656666603. The next prime is 656666669. The reversal of 656666634 is 436666656.

It is a super-2 number, since 2×656666634² = 862422136417779912, which contains 22 as substring.

It is an unprimeable number.

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, 4209324 + ... + 4209479.

It is an arithmetic number, because the mean of its divisors is an integer number (88397442).

Almost surely, 2^656666634 is an apocalyptic number.

656666634 is an abundant number, since it is smaller than the sum of its proper divisors (757692438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656666634 is a wasteful number, since it uses less digits than its factorization.

656666634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8418821.

The product of its digits is 2799360, while the sum is 48.

The square root of 656666634 is about 25625.5074876577. The cubic root of 656666634 is about 869.1905246519.

The spelling of 656666634 in words is "six hundred fifty-six million, six hundred sixty-six thousand, six hundred thirty-four".