18885338158 has 4 divisors (see below), whose sum is σ = 28328007240. Its totient is φ = 9442669078.

The previous prime is 18885338137. The next prime is 18885338177. The reversal of 18885338158 is 85183358881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85183358881 = 45707 ⋅1863683.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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 as a sum of consecutive naturals, namely, 4721334538 + ... + 4721334541.

It is an arithmetic number, because the mean of its divisors is an integer number (7082001810).

Almost surely, 2^18885338158 is an apocalyptic number.

18885338158 is a deficient number, since it is larger than the sum of its proper divisors (9442669082).

18885338158 is an equidigital number, since it uses as much as digits as its factorization.

18885338158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442669081.

The product of its digits is 7372800, while the sum is 58.

The spelling of 18885338158 in words is "eighteen billion, eight hundred eighty-five million, three hundred thirty-eight thousand, one hundred fifty-eight".