2138465656 has 32 divisors (see below), whose sum is σ = 4268106000. Its totient is φ = 1001569536.

The previous prime is 2138465647. The next prime is 2138465657. The reversal of 2138465656 is 6565648312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138465657) 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, 65511 + ... + 92566.

Almost surely, 2^2138465656 is an apocalyptic number.

It is an amenable number.

2138465656 is a deficient number, since it is larger than the sum of its proper divisors (2129640344).

2138465656 is a wasteful number, since it uses less digits than its factorization.

2138465656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158191 (or 158187 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The square root of 2138465656 is about 46243.5471822826. The cubic root of 2138465656 is about 1288.3506866934.

The spelling of 2138465656 in words is "two billion, one hundred thirty-eight million, four hundred sixty-five thousand, six hundred fifty-six".