656191239916 has 12 divisors (see below), whose sum is σ = 1153393414488. Its totient is φ = 326650264352.

The previous prime is 656191239889. The next prime is 656191239929. The reversal of 656191239916 is 619932191656.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361337881 + ... + 361339696.

It is an arithmetic number, because the mean of its divisors is an integer number (96116117874).

Almost surely, 2^656191239916 is an apocalyptic number.

It is an amenable number.

656191239916 is a deficient number, since it is larger than the sum of its proper divisors (497202174572).

656191239916 is a wasteful number, since it uses less digits than its factorization.

656191239916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722677808 (or 722677806 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 58.

The spelling of 656191239916 in words is "six hundred fifty-six billion, one hundred ninety-one million, two hundred thirty-nine thousand, nine hundred sixteen".