2161605884 has 12 divisors (see below), whose sum is σ = 3783411744. Its totient is φ = 1080631104.

The previous prime is 2161605881. The next prime is 2161605899. The reversal of 2161605884 is 4885061612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161605881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12212 + ... + 66875.

It is an arithmetic number, because the mean of its divisors is an integer number (315284312).

Almost surely, 2^2161605884 is an apocalyptic number.

It is an amenable number.

2161605884 is a deficient number, since it is larger than the sum of its proper divisors (1621805860).

2161605884 is a wasteful number, since it uses less digits than its factorization.

2161605884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85924 (or 85922 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 2161605884 is about 46493.0735056309. The cubic root of 2161605884 is about 1292.9810839400.

The spelling of 2161605884 in words is "two billion, one hundred sixty-one million, six hundred five thousand, eight hundred eighty-four".