2118361815 has 80 divisors (see below), whose sum is σ = 3884889888. Its totient is φ = 1104067584.

The previous prime is 2118361793. The next prime is 2118361849. The reversal of 2118361815 is 5181638112.

2118361815 is a `hidden beast` number, since 21 + 1 + 8 + 3 + 618 + 15 = 666.

It is not a de Polignac number, because 2118361815 - 2⁸ = 2118361559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2118361815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4050144 + ... + 4050666.

Almost surely, 2^2118361815 is an apocalyptic number.

2118361815 is a deficient number, since it is larger than the sum of its proper divisors (1766528073).

2118361815 is a wasteful number, since it uses less digits than its factorization.

2118361815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 741 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 2118361815 is about 46025.6647426194. The cubic root of 2118361815 is about 1284.3006818312.

Adding to 2118361815 its reverse (5181638112), we get a palindrome (7299999927).

The spelling of 2118361815 in words is "two billion, one hundred eighteen million, three hundred sixty-one thousand, eight hundred fifteen".