2108165640 has 64 divisors (see below), whose sum is σ = 7227999360. Its totient is φ = 481866240.

The previous prime is 2108165573. The next prime is 2108165641. The reversal of 2108165640 is 465618012.

It is not an unprimeable number, because it can be changed into a prime (2108165641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1254021 + ... + 1255700.

It is an arithmetic number, because the mean of its divisors is an integer number (112937490).

Almost surely, 2^2108165640 is an apocalyptic number.

2108165640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2108165640 is an abundant number, since it is smaller than the sum of its proper divisors (5119833720).

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

2108165640 is a wasteful number, since it uses less digits than its factorization.

2108165640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509742 (or 2509738 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 2108165640 is about 45914.7649454944. The cubic root of 2108165640 is about 1282.2368196407.

The spelling of 2108165640 in words is "two billion, one hundred eight million, one hundred sixty-five thousand, six hundred forty".