2113513668 has 72 divisors (see below), whose sum is σ = 6374104800. Its totient is φ = 603859536.

The previous prime is 2113513639. The next prime is 2113513669. The reversal of 2113513668 is 8663153112.

2113513668 is a `hidden beast` number, since 211 + 351 + 36 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2113513669) 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, 194398 + ... + 204981.

Almost surely, 2^2113513668 is an apocalyptic number.

2113513668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2113513668 is an abundant number, since it is smaller than the sum of its proper divisors (4260591132).

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

2113513668 is a wasteful number, since it uses less digits than its factorization.

2113513668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399406 (or 399391 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 2113513668 is about 45972.9667087083. The cubic root of 2113513668 is about 1283.3201702966.

The spelling of 2113513668 in words is "two billion, one hundred thirteen million, five hundred thirteen thousand, six hundred sixty-eight".