2165815472 has 20 divisors (see below), whose sum is σ = 4417124280. Its totient is φ = 1025912448.

The previous prime is 2165815459. The next prime is 2165815481. The reversal of 2165815472 is 2745185612.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3561893 + ... + 3562500.

It is an arithmetic number, because the mean of its divisors is an integer number (220856214).

Almost surely, 2^2165815472 is an apocalyptic number.

It is an amenable number.

2165815472 is an abundant number, since it is smaller than the sum of its proper divisors (2251308808).

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

2165815472 is a wasteful number, since it uses less digits than its factorization.

2165815472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124420 (or 7124414 counting only the distinct ones).

The product of its digits is 134400, while the sum is 41.

The square root of 2165815472 is about 46538.3226169573. The cubic root of 2165815472 is about 1293.8198720943.

The spelling of 2165815472 in words is "two billion, one hundred sixty-five million, eight hundred fifteen thousand, four hundred seventy-two".