2118561885 has 80 divisors (see below), whose sum is σ = 4155624000. Its totient is φ = 1024047360.

The previous prime is 2118561857. The next prime is 2118561899. The reversal of 2118561885 is 5881658112.

2118561885 is a `hidden beast` number, since 2 + 1 + 1 + 8 + 561 + 8 + 85 = 666.

It is not a de Polignac number, because 2118561885 - 2¹² = 2118557789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2118561885.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2222569 + ... + 2223521.

It is an arithmetic number, because the mean of its divisors is an integer number (51945300).

Almost surely, 2^2118561885 is an apocalyptic number.

It is an amenable number.

2118561885 is a deficient number, since it is larger than the sum of its proper divisors (2037062115).

2118561885 is a wasteful number, since it uses less digits than its factorization.

2118561885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480 (or 1471 counting only the distinct ones).

The product of its digits is 153600, while the sum is 45.

The square root of 2118561885 is about 46027.8381525789. The cubic root of 2118561885 is about 1284.3411127508.

The spelling of 2118561885 in words is "two billion, one hundred eighteen million, five hundred sixty-one thousand, eight hundred eighty-five".