18368538855 has 8 divisors (see below), whose sum is σ = 29389662192. Its totient is φ = 9796554048.

The previous prime is 18368538847. The next prime is 18368538869. The reversal of 18368538855 is 55883586381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18368538855 - 2³ = 18368538847 is a prime.

It is a super-2 number, since 2×18368538855² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612284614 + ... + 612284643.

It is an arithmetic number, because the mean of its divisors is an integer number (3673707774).

Almost surely, 2^18368538855 is an apocalyptic number.

18368538855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18368538855 is a deficient number, since it is larger than the sum of its proper divisors (11021123337).

18368538855 is a wasteful number, since it uses less digits than its factorization.

18368538855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224569265.

The product of its digits is 27648000, while the sum is 60.

The spelling of 18368538855 in words is "eighteen billion, three hundred sixty-eight million, five hundred thirty-eight thousand, eight hundred fifty-five".