656120015997 has 12 divisors (see below), whose sum is σ = 875783039040. Its totient is φ = 436935690072.

The previous prime is 656120015963. The next prime is 656120016011. The reversal of 656120015997 is 799510021656.

It is not a de Polignac number, because 656120015997 - 2¹² = 656120011901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656120015197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2404204 + ... + 2663162.

It is an arithmetic number, because the mean of its divisors is an integer number (72981919920).

Almost surely, 2^656120015997 is an apocalyptic number.

It is an amenable number.

656120015997 is a deficient number, since it is larger than the sum of its proper divisors (219663023043).

656120015997 is an frugal number, since it uses more digits than its factorization.

656120015997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260800 (or 259881 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 51.

The spelling of 656120015997 in words is "six hundred fifty-six billion, one hundred twenty million, fifteen thousand, nine hundred ninety-seven".