2556156636 has 48 divisors (see below), whose sum is σ = 7229537280. Its totient is φ = 774592560.

The previous prime is 2556156587. The next prime is 2556156643. The reversal of 2556156636 is 6366516552.

2556156636 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 1 + 5 + 6 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2556156591 and 2556156600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1074636 + ... + 1077011.

It is an arithmetic number, because the mean of its divisors is an integer number (150615360).

Almost surely, 2^2556156636 is an apocalyptic number.

It is an amenable number.

2556156636 is an abundant number, since it is smaller than the sum of its proper divisors (4673380644).

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

2556156636 is a wasteful number, since it uses less digits than its factorization.

2556156636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151671 (or 2151663 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 2556156636 is about 50558.4477214244. The cubic root of 2556156636 is about 1367.2958248779.

The spelling of 2556156636 in words is "two billion, five hundred fifty-six million, one hundred fifty-six thousand, six hundred thirty-six".