2113565868 has 72 divisors (see below), whose sum is σ = 5666038560. Its totient is φ = 662008320.

The previous prime is 2113565819. The next prime is 2113565869. The reversal of 2113565868 is 8685653112.

2113565868 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 565 + 86 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (2113565869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 431473 + ... + 436343.

It is an arithmetic number, because the mean of its divisors is an integer number (78694980).

Almost surely, 2^2113565868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2113565868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2833019280).

2113565868 is an abundant number, since it is smaller than the sum of its proper divisors (3552472692).

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

2113565868 is a wasteful number, since it uses less digits than its factorization.

2113565868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5607 (or 5602 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 2113565868 is about 45973.5344301480. The cubic root of 2113565868 is about 1283.3307354457.

The spelling of 2113565868 in words is "two billion, one hundred thirteen million, five hundred sixty-five thousand, eight hundred sixty-eight".