18669669589 has 4 divisors (see below), whose sum is σ = 18671588140. Its totient is φ = 18667751040.

The previous prime is 18669669587. The next prime is 18669669593. The reversal of 18669669589 is 98596696681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98596696681 = 7 ⋅14085242383.

It can be written as a sum of positive squares in 2 ways, for example, as 8228304100 + 10441365489 = 90710^2 + 102183^2 .

It is a cyclic number.

It is not a de Polignac number, because 18669669589 - 2¹ = 18669669587 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 (18669669587) 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, 944604 + ... + 964165.

It is an arithmetic number, because the mean of its divisors is an integer number (4667897035).

Almost surely, 2^18669669589 is an apocalyptic number.

It is an amenable number.

18669669589 is a deficient number, since it is larger than the sum of its proper divisors (1918551).

18669669589 is an equidigital number, since it uses as much as digits as its factorization.

18669669589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918550.

The product of its digits is 302330880, while the sum is 73.

The spelling of 18669669589 in words is "eighteen billion, six hundred sixty-nine million, six hundred sixty-nine thousand, five hundred eighty-nine".