2166372863 has 4 divisors (see below), whose sum is σ = 2166630600. Its totient is φ = 2166115128.

The previous prime is 2166372851. The next prime is 2166372869. The reversal of 2166372863 is 3682736612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166372863 - 2²⁸ = 1897937407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166372869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115820 + ... + 133217.

It is an arithmetic number, because the mean of its divisors is an integer number (541657650).

Almost surely, 2^2166372863 is an apocalyptic number.

2166372863 is a deficient number, since it is larger than the sum of its proper divisors (257737).

2166372863 is an equidigital number, since it uses as much as digits as its factorization.

2166372863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257736.

The product of its digits is 435456, while the sum is 44.

The square root of 2166372863 is about 46544.3107479314. The cubic root of 2166372863 is about 1293.9308544171.

The spelling of 2166372863 in words is "two billion, one hundred sixty-six million, three hundred seventy-two thousand, eight hundred sixty-three".