2155368656 has 40 divisors (see below), whose sum is σ = 4783485504. Its totient is φ = 921623040.

The previous prime is 2155368643. The next prime is 2155368661. The reversal of 2155368656 is 6568635512.

It is a super-2 number, since 2×2155368656² = 9291228086534492672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2155368656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27896 + ... + 71336.

Almost surely, 2^2155368656 is an apocalyptic number.

It is an amenable number.

2155368656 is an abundant number, since it is smaller than the sum of its proper divisors (2628116848).

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

2155368656 is a wasteful number, since it uses less digits than its factorization.

2155368656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43899 (or 43893 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 47.

The square root of 2155368656 is about 46425.9480894036. The cubic root of 2155368656 is about 1291.7362706818.

It can be divided in two parts, 21553 and 68656, that added together give a palindrome (90209).

The spelling of 2155368656 in words is "two billion, one hundred fifty-five million, three hundred sixty-eight thousand, six hundred fifty-six".