18685304440 has 32 divisors (see below), whose sum is σ = 45863930160. Its totient is φ = 6794656000.

The previous prime is 18685304383. The next prime is 18685304441. The reversal of 18685304440 is 4440358681.

It is a super-3 number, since 3×18685304440³ (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 (18685304441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21232861 + ... + 21233740.

Almost surely, 2^18685304440 is an apocalyptic number.

18685304440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18685304440 is an abundant number, since it is smaller than the sum of its proper divisors (27178625720).

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

18685304440 is a wasteful number, since it uses less digits than its factorization.

18685304440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42466623 (or 42466619 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 18685304440 in words is "eighteen billion, six hundred eighty-five million, three hundred four thousand, four hundred forty".