2166855688 has 8 divisors (see below), whose sum is σ = 4062854430. Its totient is φ = 1083427840.

The previous prime is 2166855671. The next prime is 2166855697. The reversal of 2166855688 is 8865586612.

It can be written as a sum of positive squares in only one way, i.e., 2149064164 + 17791524 = 46358^2 + 4218^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135428473 + ... + 135428488.

Almost surely, 2^2166855688 is an apocalyptic number.

It is an amenable number.

2166855688 is a deficient number, since it is larger than the sum of its proper divisors (1895998742).

2166855688 is a wasteful number, since it uses less digits than its factorization.

2166855688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270856967 (or 270856963 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 55.

The square root of 2166855688 is about 46549.4971831061. The cubic root of 2166855688 is about 1294.0269744908.

The spelling of 2166855688 in words is "two billion, one hundred sixty-six million, eight hundred fifty-five thousand, six hundred eighty-eight".