2165013906 has 16 divisors (see below), whose sum is σ = 4723666848. Its totient is φ = 656064800.

The previous prime is 2165013887. The next prime is 2165013931. The reversal of 2165013906 is 6093105612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon 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, 16401555 + ... + 16401686.

It is an arithmetic number, because the mean of its divisors is an integer number (295229178).

Almost surely, 2^2165013906 is an apocalyptic number.

2165013906 is an abundant number, since it is smaller than the sum of its proper divisors (2558652942).

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

2165013906 is a wasteful number, since it uses less digits than its factorization.

2165013906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32803257.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 2165013906 is about 46529.7099281738. The cubic root of 2165013906 is about 1293.6602386136.

The spelling of 2165013906 in words is "two billion, one hundred sixty-five million, thirteen thousand, nine hundred six".