18038186617 has 32 divisors (see below), whose sum is σ = 21952183680. Its totient is φ = 14608097280.

The previous prime is 18038186591. The next prime is 18038186633. The reversal of 18038186617 is 71668183081.

It is not a de Polignac number, because 18038186617 - 2¹⁹ = 18037662329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18038186317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6312253 + ... + 6315109.

It is an arithmetic number, because the mean of its divisors is an integer number (686005740).

Almost surely, 2^18038186617 is an apocalyptic number.

18038186617 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18038186617 is a deficient number, since it is larger than the sum of its proper divisors (3913997063).

18038186617 is a wasteful number, since it uses less digits than its factorization.

18038186617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 18038186617 in words is "eighteen billion, thirty-eight million, one hundred eighty-six thousand, six hundred seventeen".