2157960656 has 20 divisors (see below), whose sum is σ = 4243454592. Its totient is φ = 1062875616.

The previous prime is 2157960631. The next prime is 2157960677. The reversal of 2157960656 is 6560697512.

It is a happy number.

2157960656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2157960656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005440 + ... + 1007583.

Almost surely, 2^2157960656 is an apocalyptic number.

It is an amenable number.

2157960656 is a deficient number, since it is larger than the sum of its proper divisors (2085493936).

2157960656 is a wasteful number, since it uses less digits than its factorization.

2157960656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013098 (or 2013092 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 47.

The square root of 2157960656 is about 46453.8551252746. The cubic root of 2157960656 is about 1292.2538680080.

The spelling of 2157960656 in words is "two billion, one hundred fifty-seven million, nine hundred sixty thousand, six hundred fifty-six".