18885302138 has 4 divisors (see below), whose sum is σ = 28327953210. Its totient is φ = 9442651068.

The previous prime is 18885302131. The next prime is 18885302147. The reversal of 18885302138 is 83120358881.

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., 18735313129 + 149989009 = 136877^2 + 12247^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18885302092 and 18885302101.

It is not an unprimeable number, because it can be changed into a prime (18885302131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4721325533 + ... + 4721325536.

Almost surely, 2^18885302138 is an apocalyptic number.

18885302138 is a deficient number, since it is larger than the sum of its proper divisors (9442651072).

18885302138 is an equidigital number, since it uses as much as digits as its factorization.

18885302138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9442651071.

The product of its (nonzero) digits is 368640, while the sum is 47.

The spelling of 18885302138 in words is "eighteen billion, eight hundred eighty-five million, three hundred two thousand, one hundred thirty-eight".