2166715868 has 12 divisors (see below), whose sum is σ = 3792148920. Its totient is φ = 1083244752.

The previous prime is 2166715813. The next prime is 2166715877. The reversal of 2166715868 is 8685176612.

It is a congruent 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, 26618 + ... + 71006.

It is an arithmetic number, because the mean of its divisors is an integer number (316012410).

Almost surely, 2^2166715868 is an apocalyptic number.

It is an amenable number.

2166715868 is a deficient number, since it is larger than the sum of its proper divisors (1625433052).

2166715868 is a wasteful number, since it uses less digits than its factorization.

2166715868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56596 (or 56594 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 2166715868 is about 46547.9953166621. The cubic root of 2166715868 is about 1293.9991408047. Note that the first 3 decimals are identical.

The spelling of 2166715868 in words is "two billion, one hundred sixty-six million, seven hundred fifteen thousand, eight hundred sixty-eight".