656566318816 has 12 divisors (see below), whose sum is σ = 1292614940232. Its totient is φ = 328283159392.

The previous prime is 656566318813. The next prime is 656566318831. The reversal of 656566318816 is 618813665656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656566318813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258848700 + ... + 10258848763.

It is an arithmetic number, because the mean of its divisors is an integer number (107717911686).

Almost surely, 2^656566318816 is an apocalyptic number.

It is an amenable number.

656566318816 is a deficient number, since it is larger than the sum of its proper divisors (636048621416).

656566318816 is a wasteful number, since it uses less digits than its factorization.

656566318816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20517697473 (or 20517697465 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 61.

The spelling of 656566318816 in words is "six hundred fifty-six billion, five hundred sixty-six million, three hundred eighteen thousand, eight hundred sixteen".