2156637912 has 64 divisors (see below), whose sum is σ = 6334191360. Its totient is φ = 603254400.

The previous prime is 2156637871. The next prime is 2156637947. The reversal of 2156637912 is 2197366512.

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, 310764 + ... + 317627.

It is an arithmetic number, because the mean of its divisors is an integer number (98971740).

Almost surely, 2^2156637912 is an apocalyptic number.

2156637912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2156637912 is an abundant number, since it is smaller than the sum of its proper divisors (4177553448).

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

2156637912 is a wasteful number, since it uses less digits than its factorization.

2156637912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628424 (or 628420 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 2156637912 is about 46439.6157606843. The cubic root of 2156637912 is about 1291.9897806449.

The spelling of 2156637912 in words is "two billion, one hundred fifty-six million, six hundred thirty-seven thousand, nine hundred twelve".