2166447944 has 32 divisors (see below), whose sum is σ = 4283344800. Its totient is φ = 1024421760.

The previous prime is 2166447923. The next prime is 2166447961. The reversal of 2166447944 is 4497446612.

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, 77084 + ... + 101364.

It is an arithmetic number, because the mean of its divisors is an integer number (133854525).

Almost surely, 2^2166447944 is an apocalyptic number.

It is an amenable number.

2166447944 is a deficient number, since it is larger than the sum of its proper divisors (2116896856).

2166447944 is a wasteful number, since it uses less digits than its factorization.

2166447944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24893 (or 24889 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 47.

The square root of 2166447944 is about 46545.1172949430. The cubic root of 2166447944 is about 1293.9458023671.

The spelling of 2166447944 in words is "two billion, one hundred sixty-six million, four hundred forty-seven thousand, nine hundred forty-four".