18431063155 has 4 divisors (see below), whose sum is σ = 22117275792. Its totient is φ = 14744850520.

The previous prime is 18431063149. The next prime is 18431063201. The reversal of 18431063155 is 55136013481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55136013481 = 4549 ⋅12120469.

It is not a de Polignac number, because 18431063155 - 2¹³ = 18431054963 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843106311 + ... + 1843106320.

It is an arithmetic number, because the mean of its divisors is an integer number (5529318948).

Almost surely, 2^18431063155 is an apocalyptic number.

18431063155 is a deficient number, since it is larger than the sum of its proper divisors (3686212637).

18431063155 is an equidigital number, since it uses as much as digits as its factorization.

18431063155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686212636.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 18431063155 in words is "eighteen billion, four hundred thirty-one million, sixty-three thousand, one hundred fifty-five".