18338667205550 has 24 divisors (see below), whose sum is σ = 34110621412200. Its totient is φ = 7335316256480.

The previous prime is 18338667205513. The next prime is 18338667205589. The reversal of 18338667205550 is 5550276683381.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18338667205550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1290185 + ... + 6192084.

It is an arithmetic number, because the mean of its divisors is an integer number (1421275892175).

Almost surely, 2^{18338667205550} is an apocalyptic number.

18338667205550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18338667205550 is a deficient number, since it is larger than the sum of its proper divisors (15771954206650).

18338667205550 is a wasteful number, since it uses less digits than its factorization.

18338667205550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7531300 (or 7531295 counting only the distinct ones).

The product of its (nonzero) digits is 36288000, while the sum is 59.

The spelling of 18338667205550 in words is "eighteen trillion, three hundred thirty-eight billion, six hundred sixty-seven million, two hundred five thousand, five hundred fifty".