2656165640 has 16 divisors (see below), whose sum is σ = 5976372780. Its totient is φ = 1062466240.

The previous prime is 2656165609. The next prime is 2656165669. The reversal of 2656165640 is 465616562.

2656165640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2656165444 + 196 = 51538^2 + 14^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33202031 + ... + 33202110.

Almost surely, 2^2656165640 is an apocalyptic number.

2656165640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2656165640 is an abundant number, since it is smaller than the sum of its proper divisors (3320207140).

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

2656165640 is a wasteful number, since it uses less digits than its factorization.

2656165640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66404152 (or 66404148 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 2656165640 is about 51538.0019015095. The cubic root of 2656165640 is about 1384.8999028390.

The spelling of 2656165640 in words is "two billion, six hundred fifty-six million, one hundred sixty-five thousand, six hundred forty".