2165643112 has 16 divisors (see below), whose sum is σ = 4116206340. Its totient is φ = 1067988096.

The previous prime is 2165643101. The next prime is 2165643127. The reversal of 2165643112 is 2113465612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2163552196 + 2090916 = 46514^2 + 1446^2 .

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, 1853563 + ... + 1854730.

Almost surely, 2^2165643112 is an apocalyptic number.

It is an amenable number.

2165643112 is a deficient number, since it is larger than the sum of its proper divisors (1950563228).

2165643112 is a wasteful number, since it uses less digits than its factorization.

2165643112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708372 (or 3708368 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 2165643112 is about 46536.4707729325. The cubic root of 2165643112 is about 1293.7855495782.

The spelling of 2165643112 in words is "two billion, one hundred sixty-five million, six hundred forty-three thousand, one hundred twelve".