2118561912 has 64 divisors (see below), whose sum is σ = 5888736000. Its totient is φ = 705726432.

The previous prime is 2118561899. The next prime is 2118561941. The reversal of 2118561912 is 2191658112.

2118561912 is a `hidden beast` number, since 2 + 1 + 1 + 8 + 561 + 91 + 2 = 666.

2118561912 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546493 + ... + 550355.

It is an arithmetic number, because the mean of its divisors is an integer number (92011500).

Almost surely, 2^2118561912 is an apocalyptic number.

It is an amenable number.

2118561912 is an abundant number, since it is smaller than the sum of its proper divisors (3770174088).

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

2118561912 is a wasteful number, since it uses less digits than its factorization.

2118561912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6417 (or 6407 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 2118561912 is about 46027.8384458797. The cubic root of 2118561912 is about 1284.3411182069.

The spelling of 2118561912 in words is "two billion, one hundred eighteen million, five hundred sixty-one thousand, nine hundred twelve".