2166365803 has 6 divisors (see below), whose sum is σ = 2520058236. Its totient is φ = 1856884932.

The previous prime is 2166365779. The next prime is 2166365809. The reversal of 2166365803 is 3085636612.

It is not a de Polignac number, because 2166365803 - 2⁵ = 2166365771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166365809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22105725 + ... + 22105822.

It is an arithmetic number, because the mean of its divisors is an integer number (420009706).

Almost surely, 2^2166365803 is an apocalyptic number.

2166365803 is a deficient number, since it is larger than the sum of its proper divisors (353692433).

2166365803 is an equidigital number, since it uses as much as digits as its factorization.

2166365803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44211561 (or 44211554 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 2166365803 is about 46544.2349061621. The cubic root of 2166365803 is about 1293.9294488170.

The spelling of 2166365803 in words is "two billion, one hundred sixty-six million, three hundred sixty-five thousand, eight hundred three".