656580120016 has 20 divisors (see below), whose sum is σ = 1284474704032. Its totient is φ = 325102777056.

The previous prime is 656580119929. The next prime is 656580120019. The reversal of 656580120016 is 610021085656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656580120019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199203486 + ... + 199206781.

Almost surely, 2^656580120016 is an apocalyptic number.

It is an amenable number.

656580120016 is a deficient number, since it is larger than the sum of its proper divisors (627894584016).

656580120016 is a wasteful number, since it uses less digits than its factorization.

656580120016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398410378 (or 398410372 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 656580120016 in words is "six hundred fifty-six billion, five hundred eighty million, one hundred twenty thousand, sixteen".