2166404356 has 24 divisors (see below), whose sum is σ = 3880507904. Its totient is φ = 1057976640.

The previous prime is 2166404351. The next prime is 2166404363. The reversal of 2166404356 is 6534046612.

It is not an unprimeable number, because it can be changed into a prime (2166404351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5940 + ... + 66091.

Almost surely, 2^2166404356 is an apocalyptic number.

It is an amenable number.

2166404356 is a deficient number, since it is larger than the sum of its proper divisors (1714103548).

2166404356 is a wasteful number, since it uses less digits than its factorization.

2166404356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72211 (or 72209 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 2166404356 is about 46544.6490587264. The cubic root of 2166404356 is about 1293.9371244314.

The spelling of 2166404356 in words is "two billion, one hundred sixty-six million, four hundred four thousand, three hundred fifty-six".