18038213715 has 32 divisors (see below), whose sum is σ = 31135461696. Its totient is φ = 8883630080.

The previous prime is 18038213689. The next prime is 18038213729. The reversal of 18038213715 is 51731283081.

It is not a de Polignac number, because 18038213715 - 2¹⁹ = 18037689427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 653826 + ... + 680855.

It is an arithmetic number, because the mean of its divisors is an integer number (972983178).

Almost surely, 2^18038213715 is an apocalyptic number.

18038213715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18038213715 is a deficient number, since it is larger than the sum of its proper divisors (13097247981).

18038213715 is a wasteful number, since it uses less digits than its factorization.

18038213715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334759.

The product of its (nonzero) digits is 40320, while the sum is 39.

Adding to 18038213715 its reverse (51731283081), we get a palindrome (69769496796).

The spelling of 18038213715 in words is "eighteen billion, thirty-eight million, two hundred thirteen thousand, seven hundred fifteen".