18487275238 has 4 divisors (see below), whose sum is σ = 27730912860. Its totient is φ = 9243637618.

The previous prime is 18487275217. The next prime is 18487275241. The reversal of 18487275238 is 83257278481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83257278481 = 13 ⋅6404406037.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4621818808 + ... + 4621818811.

It is an arithmetic number, because the mean of its divisors is an integer number (6932728215).

Almost surely, 2^18487275238 is an apocalyptic number.

18487275238 is a deficient number, since it is larger than the sum of its proper divisors (9243637622).

18487275238 is an equidigital number, since it uses as much as digits as its factorization.

18487275238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9243637621.

The product of its digits is 6021120, while the sum is 55.

The spelling of 18487275238 in words is "eighteen billion, four hundred eighty-seven million, two hundred seventy-five thousand, two hundred thirty-eight".