18185818364 has 12 divisors (see below), whose sum is σ = 36371636784. Its totient is φ = 7793922144.

The previous prime is 18185818361. The next prime is 18185818373. The reversal of 18185818364 is 46381858181.

18185818364 is an admirable number.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18185818361) 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, 324746729 + ... + 324746784.

It is an arithmetic number, because the mean of its divisors is an integer number (3030969732).

Almost surely, 2^18185818364 is an apocalyptic number.

18185818364 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18185818364 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18185818364 is a wasteful number, since it uses less digits than its factorization.

18185818364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649493524 (or 649493522 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 53.

The spelling of 18185818364 in words is "eighteen billion, one hundred eighty-five million, eight hundred eighteen thousand, three hundred sixty-four".