18138532294 has 4 divisors (see below), whose sum is σ = 27207798444. Its totient is φ = 9069266146.

The previous prime is 18138532289. The next prime is 18138532301. The reversal of 18138532294 is 49223583181.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4534633072 + ... + 4534633075.

It is an arithmetic number, because the mean of its divisors is an integer number (6801949611).

Almost surely, 2^18138532294 is an apocalyptic number.

18138532294 is a deficient number, since it is larger than the sum of its proper divisors (9069266150).

18138532294 is an equidigital number, since it uses as much as digits as its factorization.

18138532294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9069266149.

The product of its digits is 414720, while the sum is 46.

The spelling of 18138532294 in words is "eighteen billion, one hundred thirty-eight million, five hundred thirty-two thousand, two hundred ninety-four".