16669643389 has 4 divisors (see below), whose sum is σ = 19051021024. Its totient is φ = 14288265756.

The previous prime is 16669643371. The next prime is 16669643399. The reversal of 16669643389 is 98334696661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98334696661 = 29 ⋅3390851609.

It is a cyclic number.

It is not a de Polignac number, because 16669643389 - 2⁷ = 16669643261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16669643399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190688807 + ... + 1190688820.

It is an arithmetic number, because the mean of its divisors is an integer number (4762755256).

Almost surely, 2^16669643389 is an apocalyptic number.

It is an amenable number.

16669643389 is a deficient number, since it is larger than the sum of its proper divisors (2381377635).

16669643389 is an equidigital number, since it uses as much as digits as its factorization.

16669643389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381377634.

The product of its digits is 30233088, while the sum is 61.

The spelling of 16669643389 in words is "sixteen billion, six hundred sixty-nine million, six hundred forty-three thousand, three hundred eighty-nine".