18765065990 has 48 divisors (see below), whose sum is σ = 37228959936. Its totient is φ = 6804906240.

The previous prime is 18765065971. The next prime is 18765065993. The reversal of 18765065990 is 9956056781.

18765065990 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18765065993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 422942 + ... + 465198.

It is an arithmetic number, because the mean of its divisors is an integer number (775603332).

Almost surely, 2^18765065990 is an apocalyptic number.

18765065990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18765065990 is a deficient number, since it is larger than the sum of its proper divisors (18463893946).

18765065990 is a wasteful number, since it uses less digits than its factorization.

18765065990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42653 (or 42642 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 56.

The spelling of 18765065990 in words is "eighteen billion, seven hundred sixty-five million, sixty-five thousand, nine hundred ninety".