2166323656 has 32 divisors (see below), whose sum is σ = 4767589440. Its totient is φ = 903331008.

The previous prime is 2166323639. The next prime is 2166323657. The reversal of 2166323656 is 6563236612.

It is not an unprimeable number, because it can be changed into a prime (2166323657) 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, 520690 + ... + 524833.

It is an arithmetic number, because the mean of its divisors is an integer number (148987170).

Almost surely, 2^2166323656 is an apocalyptic number.

It is an amenable number.

2166323656 is an abundant number, since it is smaller than the sum of its proper divisors (2601265784).

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

2166323656 is a wasteful number, since it uses less digits than its factorization.

2166323656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045573 (or 1045569 counting only the distinct ones).

The product of its digits is 233280, while the sum is 40.

The square root of 2166323656 is about 46543.7821411196. The cubic root of 2166323656 is about 1293.9210575597.

The spelling of 2166323656 in words is "two billion, one hundred sixty-six million, three hundred twenty-three thousand, six hundred fifty-six".