2172237656 has 8 divisors (see below), whose sum is σ = 4072945620. Its totient is φ = 1086118824.

The previous prime is 2172237647. The next prime is 2172237659. The reversal of 2172237656 is 6567322712.

2172237656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172237659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135764846 + ... + 135764861.

Almost surely, 2^2172237656 is an apocalyptic number.

It is an amenable number.

2172237656 is a deficient number, since it is larger than the sum of its proper divisors (1900707964).

2172237656 is a wasteful number, since it uses less digits than its factorization.

2172237656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271529713 (or 271529709 counting only the distinct ones).

The product of its digits is 211680, while the sum is 41.

The square root of 2172237656 is about 46607.2704199677. The cubic root of 2172237656 is about 1295.0974432125.

The spelling of 2172237656 in words is "two billion, one hundred seventy-two million, two hundred thirty-seven thousand, six hundred fifty-six".