1666913899 has 12 divisors (see below), whose sum is σ = 1991472384. Its totient is φ = 1390166064.

The previous prime is 1666913893. The next prime is 1666913923. The reversal of 1666913899 is 9983196661.

It is not a de Polignac number, because 1666913899 - 2⁵ = 1666913867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666913893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 457899 + ... + 461524.

It is an arithmetic number, because the mean of its divisors is an integer number (165956032).

Almost surely, 2^1666913899 is an apocalyptic number.

1666913899 is a deficient number, since it is larger than the sum of its proper divisors (324558485).

1666913899 is an equidigital number, since it uses as much as digits as its factorization.

1666913899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919474 (or 919467 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 58.

The square root of 1666913899 is about 40827.8568994259. The cubic root of 1666913899 is about 1185.6897238669.

The spelling of 1666913899 in words is "one billion, six hundred sixty-six million, nine hundred thirteen thousand, eight hundred ninety-nine".