18915368218 has 8 divisors (see below), whose sum is σ = 28379668212. Its totient is φ = 9455478816.

The previous prime is 18915368111. The next prime is 18915368237. The reversal of 18915368218 is 81286351981.

It can be written as a sum of positive squares in 2 ways, for example, as 18715060809 + 200307409 = 136803^2 + 14153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091905 + ... + 1109092.

Almost surely, 2^18915368218 is an apocalyptic number.

18915368218 is a deficient number, since it is larger than the sum of its proper divisors (9464299994).

18915368218 is a wasteful number, since it uses less digits than its factorization.

18915368218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205296.

The product of its digits is 829440, while the sum is 52.

The spelling of 18915368218 in words is "eighteen billion, nine hundred fifteen million, three hundred sixty-eight thousand, two hundred eighteen".