2166489976931 has 4 divisors (see below), whose sum is σ = 2475988545072. Its totient is φ = 1856991408792.

The previous prime is 2166489976877. The next prime is 2166489976933. The reversal of 2166489976931 is 1396799846612.

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 2166489976931 - 2¹⁰ = 2166489975907 is a prime.

It is a super-2 number, since 2×2166489976931² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2166489976933) 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, 154749284060 + ... + 154749284073.

It is an arithmetic number, because the mean of its divisors is an integer number (618997136268).

Almost surely, 2^{2166489976931} is an apocalyptic number.

2166489976931 is a deficient number, since it is larger than the sum of its proper divisors (309498568141).

2166489976931 is an equidigital number, since it uses as much as digits as its factorization.

2166489976931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309498568140.

The product of its digits is 211631616, while the sum is 71.

The spelling of 2166489976931 in words is "two trillion, one hundred sixty-six billion, four hundred eighty-nine million, nine hundred seventy-six thousand, nine hundred thirty-one".