18802639018 has 4 divisors (see below), whose sum is σ = 28203958530. Its totient is φ = 9401319508.

The previous prime is 18802638973. The next prime is 18802639061. The reversal of 18802639018 is 81093620881.

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

It can be written as a sum of positive squares in only one way, i.e., 15327182809 + 3475456209 = 123803^2 + 58953^2 .

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, 4700659753 + ... + 4700659756.

Almost surely, 2^18802639018 is an apocalyptic number.

18802639018 is a deficient number, since it is larger than the sum of its proper divisors (9401319512).

18802639018 is an equidigital number, since it uses as much as digits as its factorization.

18802639018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9401319511.

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 18802639018 in words is "eighteen billion, eight hundred two million, six hundred thirty-nine thousand, eighteen".