2165966164 has 12 divisors (see below), whose sum is σ = 3818109204. Its totient is φ = 1075077824.

The previous prime is 2165966149. The next prime is 2165966171. The reversal of 2165966164 is 4616695612.

It can be written as a sum of positive squares in 2 ways, for example, as 1403101764 + 762864400 = 37458^2 + 27620^2 .

It is a congruent number.

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, 1975699 + ... + 1976794.

It is an arithmetic number, because the mean of its divisors is an integer number (318175767).

Almost surely, 2^2165966164 is an apocalyptic number.

It is an amenable number.

2165966164 is a deficient number, since it is larger than the sum of its proper divisors (1652143040).

2165966164 is a wasteful number, since it uses less digits than its factorization.

2165966164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952634 (or 3952632 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 2165966164 is about 46539.9415985882. The cubic root of 2165966164 is about 1293.8498783106.

The spelling of 2165966164 in words is "two billion, one hundred sixty-five million, nine hundred sixty-six thousand, one hundred sixty-four".