656615516656 has 20 divisors (see below), whose sum is σ = 1387846433304. Its totient is φ = 298461598400.

The previous prime is 656615516653. The next prime is 656615516663.

656615516656 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×656615516656² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 656615516656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656615516653) by changing a digit.

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, 1865384815 + ... + 1865385166.

Almost surely, 2^656615516656 is an apocalyptic number.

It is an amenable number.

656615516656 is an abundant number, since it is smaller than the sum of its proper divisors (731230916648).

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

656615516656 is a wasteful number, since it uses less digits than its factorization.

656615516656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730770000 (or 3730769994 counting only the distinct ones).

The product of its digits is 29160000, while the sum is 58.

The spelling of 656615516656 in words is "six hundred fifty-six billion, six hundred fifteen million, five hundred sixteen thousand, six hundred fifty-six".