18381886808 has 16 divisors (see below), whose sum is σ = 34469015280. Its totient is φ = 9190149408.

The previous prime is 18381886807. The next prime is 18381886811. The reversal of 18381886808 is 80868818381.

It is a super-3 number, since 3×18381886808³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381886807) 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, 5666 + ... + 191822.

It is an arithmetic number, because the mean of its divisors is an integer number (2154313455).

Almost surely, 2^18381886808 is an apocalyptic number.

It is an amenable number.

18381886808 is a deficient number, since it is larger than the sum of its proper divisors (16087128472).

18381886808 is a wasteful number, since it uses less digits than its factorization.

18381886808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198506 (or 198502 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 59.

The spelling of 18381886808 in words is "eighteen billion, three hundred eighty-one million, eight hundred eighty-six thousand, eight hundred eight".