2166566015756 has 12 divisors (see below), whose sum is σ = 3820433204280. Its totient is φ = 1075013671680.

The previous prime is 2166566015671. The next prime is 2166566015773. The reversal of 2166566015756 is 6575106656612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067333461 + ... + 2067334508.

It is an arithmetic number, because the mean of its divisors is an integer number (318369433690).

Almost surely, 2^{2166566015756} is an apocalyptic number.

It is an amenable number.

2166566015756 is a deficient number, since it is larger than the sum of its proper divisors (1653867188524).

2166566015756 is a wasteful number, since it uses less digits than its factorization.

2166566015756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134668104 (or 4134668102 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 56.

The spelling of 2166566015756 in words is "two trillion, one hundred sixty-six billion, five hundred sixty-six million, fifteen thousand, seven hundred fifty-six".