2151210666 has 32 divisors (see below), whose sum is σ = 4940582400. Its totient is φ = 617572080.

The previous prime is 2151210643. The next prime is 2151210679. The reversal of 2151210666 is 6660121512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 856486 + ... + 858993.

It is an arithmetic number, because the mean of its divisors is an integer number (154393200).

Almost surely, 2^2151210666 is an apocalyptic number.

2151210666 is an abundant number, since it is smaller than the sum of its proper divisors (2789371734).

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

2151210666 is a wasteful number, since it uses less digits than its factorization.

2151210666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715514.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2151210666 is about 46381.1455874044. The cubic root of 2151210666 is about 1290.9050928393.

The spelling of 2151210666 in words is "two billion, one hundred fifty-one million, two hundred ten thousand, six hundred sixty-six".