18802450138 has 4 divisors (see below), whose sum is σ = 28203675210. Its totient is φ = 9401225068.

The previous prime is 18802450091. The next prime is 18802450189. The reversal of 18802450138 is 83105420881.

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., 11930537529 + 6871912609 = 109227^2 + 82897^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18802450138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4700612533 + ... + 4700612536.

Almost surely, 2^18802450138 is an apocalyptic number.

18802450138 is a deficient number, since it is larger than the sum of its proper divisors (9401225072).

18802450138 is an equidigital number, since it uses as much as digits as its factorization.

18802450138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401225071.

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 18802450138 in words is "eighteen billion, eight hundred two million, four hundred fifty thousand, one hundred thirty-eight".