18669409788 has 12 divisors (see below), whose sum is σ = 43561956200. Its totient is φ = 6223136592.

The previous prime is 18669409783. The next prime is 18669409799. The reversal of 18669409788 is 88790496681.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669409783) 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 3 ways as a sum of consecutive naturals, for example, 777892063 + ... + 777892086.

Almost surely, 2^18669409788 is an apocalyptic number.

It is an amenable number.

18669409788 is an abundant number, since it is smaller than the sum of its proper divisors (24892546412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18669409788 is a wasteful number, since it uses less digits than its factorization.

18669409788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555784156 (or 1555784154 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 66.

The spelling of 18669409788 in words is "eighteen billion, six hundred sixty-nine million, four hundred nine thousand, seven hundred eighty-eight".