18400018364 has 24 divisors (see below), whose sum is σ = 39630809568. Its totient is φ = 7279128000.

The previous prime is 18400018363. The next prime is 18400018381. The reversal of 18400018364 is 46381000481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18400018363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25274387 + ... + 25275114.

It is an arithmetic number, because the mean of its divisors is an integer number (1651283732).

Almost surely, 2^18400018364 is an apocalyptic number.

18400018364 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18400018364 is an abundant number, since it is smaller than the sum of its proper divisors (21230791204).

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

18400018364 is a wasteful number, since it uses less digits than its factorization.

18400018364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50549525 (or 50549523 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 18400018364 in words is "eighteen billion, four hundred million, eighteen thousand, three hundred sixty-four".