2172888866 has 16 divisors (see below), whose sum is σ = 3352648320. Its totient is φ = 1055672400.

The previous prime is 2172888841. The next prime is 2172888871. The reversal of 2172888866 is 6688882712.

It is a happy 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, 70085 + ... + 96216.

It is an arithmetic number, because the mean of its divisors is an integer number (209540520).

Almost surely, 2^2172888866 is an apocalyptic number.

2172888866 is a deficient number, since it is larger than the sum of its proper divisors (1179759454).

2172888866 is a wasteful number, since it uses less digits than its factorization.

2172888866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166489.

The product of its digits is 4128768, while the sum is 56.

The square root of 2172888866 is about 46614.2560382551. The cubic root of 2172888866 is about 1295.2268483506.

The spelling of 2172888866 in words is "two billion, one hundred seventy-two million, eight hundred eighty-eight thousand, eight hundred sixty-six".