18778660186 has 16 divisors (see below), whose sum is σ = 33092464608. Its totient is φ = 7879158000.

The previous prime is 18778660177. The next prime is 18778660211. The reversal of 18778660186 is 68106687781.

It is a self number, because there is not a number n which added to its sum of digits gives 18778660186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32829540 + ... + 32830111.

It is an arithmetic number, because the mean of its divisors is an integer number (2068279038).

Almost surely, 2^18778660186 is an apocalyptic number.

18778660186 is a deficient number, since it is larger than the sum of its proper divisors (14313804422).

18778660186 is a wasteful number, since it uses less digits than its factorization.

18778660186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65659677.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 18778660186 in words is "eighteen billion, seven hundred seventy-eight million, six hundred sixty thousand, one hundred eighty-six".