2165615064 has 48 divisors (see below), whose sum is σ = 5869183320. Its totient is φ = 721382400.

The previous prime is 2165615047. The next prime is 2165615183. The reversal of 2165615064 is 4605165612.

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 11 ways as a sum of consecutive naturals, for example, 105879 + ... + 124665.

Almost surely, 2^2165615064 is an apocalyptic number.

2165615064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2165615064 is an abundant number, since it is smaller than the sum of its proper divisors (3703568256).

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

2165615064 is a wasteful number, since it uses less digits than its factorization.

2165615064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20400 (or 20393 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 2165615064 is about 46536.1694169170. The cubic root of 2165615064 is about 1293.7799641313.

The spelling of 2165615064 in words is "two billion, one hundred sixty-five million, six hundred fifteen thousand, sixty-four".