2166858863 has 16 divisors (see below), whose sum is σ = 2411678976. Its totient is φ = 1933355520.

The previous prime is 2166858853. The next prime is 2166858899. The reversal of 2166858863 is 3688586612.

It is a cyclic number.

It is not a de Polignac number, because 2166858863 - 2²⁶ = 2099749999 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166858823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399095 + ... + 404487.

It is an arithmetic number, because the mean of its divisors is an integer number (150729936).

Almost surely, 2^2166858863 is an apocalyptic number.

2166858863 is a deficient number, since it is larger than the sum of its proper divisors (244820113).

2166858863 is a wasteful number, since it uses less digits than its factorization.

2166858863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6434.

The product of its digits is 3317760, while the sum is 53.

The square root of 2166858863 is about 46549.5312865769. The cubic root of 2166858863 is about 1294.0276065177.

The spelling of 2166858863 in words is "two billion, one hundred sixty-six million, eight hundred fifty-eight thousand, eight hundred sixty-three".