2161864798 has 16 divisors (see below), whose sum is σ = 3385404000. Its totient is φ = 1034080992.

The previous prime is 2161864751. The next prime is 2161864807. The reversal of 2161864798 is 8974681612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164658 + ... + 177301.

It is an arithmetic number, because the mean of its divisors is an integer number (211587750).

Almost surely, 2^2161864798 is an apocalyptic number.

2161864798 is a deficient number, since it is larger than the sum of its proper divisors (1223539202).

2161864798 is a wasteful number, since it uses less digits than its factorization.

2161864798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342099.

The product of its digits is 1161216, while the sum is 52.

The square root of 2161864798 is about 46495.8578585233. The cubic root of 2161864798 is about 1293.0327056751.

The spelling of 2161864798 in words is "two billion, one hundred sixty-one million, eight hundred sixty-four thousand, seven hundred ninety-eight".