18636418038550 has 36 divisors (see below), whose sum is σ = 37535289791940. Its totient is φ = 6881138964960.

The previous prime is 18636418038517. The next prime is 18636418038551. The reversal of 18636418038550 is 5583081463681.

It is a super-2 number, since 2×18636418038550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18636418038551) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1102738180 + ... + 1102755079.

It is an arithmetic number, because the mean of its divisors is an integer number (1042646938665).

Almost surely, 2^{18636418038550} is an apocalyptic number.

18636418038550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18636418038550 is an abundant number, since it is smaller than the sum of its proper divisors (18898871753390).

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

18636418038550 is a wasteful number, since it uses less digits than its factorization.

18636418038550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205493297 (or 2205493279 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 58.

The spelling of 18636418038550 in words is "eighteen trillion, six hundred thirty-six billion, four hundred eighteen million, thirty-eight thousand, five hundred fifty".