2113661656 has 16 divisors (see below), whose sum is σ = 3965515200. Its totient is φ = 1056190944.

The previous prime is 2113661633. The next prime is 2113661681. The reversal of 2113661656 is 6561663112.

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, 65800 + ... + 92503.

It is an arithmetic number, because the mean of its divisors is an integer number (247844700).

Almost surely, 2^2113661656 is an apocalyptic number.

It is an amenable number.

2113661656 is a deficient number, since it is larger than the sum of its proper divisors (1851853544).

2113661656 is a wasteful number, since it uses less digits than its factorization.

2113661656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159978 (or 159974 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 2113661656 is about 45974.5761916301. The cubic root of 2113661656 is about 1283.3501222443.

The spelling of 2113661656 in words is "two billion, one hundred thirteen million, six hundred sixty-one thousand, six hundred fifty-six".