656656615065 has 16 divisors (see below), whose sum is σ = 1146164273856. Its totient is φ = 318378964800.

The previous prime is 656656615061. The next prime is 656656615073. The reversal of 656656615065 is 560516656656.

It is not a de Polignac number, because 656656615065 - 2² = 656656615061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 656656614996 and 656656615014.

It is not an unprimeable number, because it can be changed into a prime (656656615061) 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 15 ways as a sum of consecutive naturals, for example, 1989868366 + ... + 1989868695.

It is an arithmetic number, because the mean of its divisors is an integer number (71635267116).

Almost surely, 2^656656615065 is an apocalyptic number.

It is an amenable number.

656656615065 is a deficient number, since it is larger than the sum of its proper divisors (489507658791).

656656615065 is a wasteful number, since it uses less digits than its factorization.

656656615065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979737080.

The product of its (nonzero) digits is 29160000, while the sum is 57.

It can be divided in two parts, 656656 and 615065, that added together give a palindrome (1271721).

The spelling of 656656615065 in words is "six hundred fifty-six billion, six hundred fifty-six million, six hundred fifteen thousand, sixty-five".