2143650666 has 32 divisors (see below), whose sum is σ = 4553281728. Its totient is φ = 670475520.

The previous prime is 2143650643. The next prime is 2143650703. The reversal of 2143650666 is 6660563412.

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, 2016 + ... + 65508.

It is an arithmetic number, because the mean of its divisors is an integer number (142290054).

Almost surely, 2^2143650666 is an apocalyptic number.

2143650666 is an abundant number, since it is smaller than the sum of its proper divisors (2409631062).

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

2143650666 is a wasteful number, since it uses less digits than its factorization.

2143650666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63846.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 2143650666 is about 46299.5752248333. The cubic root of 2143650666 is about 1289.3911085929.

The spelling of 2143650666 in words is "two billion, one hundred forty-three million, six hundred fifty thousand, six hundred sixty-six".