2156551684 has 24 divisors (see below), whose sum is σ = 4314369920. Its totient is φ = 923965056.

The previous prime is 2156551591. The next prime is 2156551687. The reversal of 2156551684 is 4861556512.

It is a self number, because there is not a number n which added to its sum of digits gives 2156551684.

It is not an unprimeable number, because it can be changed into a prime (2156551687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107737 + ... + 126175.

Almost surely, 2^2156551684 is an apocalyptic number.

It is an amenable number.

2156551684 is an abundant number, since it is smaller than the sum of its proper divisors (2157818236).

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

2156551684 is a wasteful number, since it uses less digits than its factorization.

2156551684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22627 (or 22625 counting only the distinct ones).

The product of its digits is 288000, while the sum is 43.

The square root of 2156551684 is about 46438.6873630166. The cubic root of 2156551684 is about 1291.9725613767.

The spelling of 2156551684 in words is "two billion, one hundred fifty-six million, five hundred fifty-one thousand, six hundred eighty-four".