18520379578 has 8 divisors (see below), whose sum is σ = 27785899872. Its totient is φ = 9258412956.

The previous prime is 18520379573. The next prime is 18520379587. The reversal of 18520379578 is 87597302581.

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

It is not an unprimeable number, because it can be changed into a prime (18520379573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875350 + ... + 896257.

It is an arithmetic number, because the mean of its divisors is an integer number (3473237484).

Almost surely, 2^18520379578 is an apocalyptic number.

18520379578 is a deficient number, since it is larger than the sum of its proper divisors (9265520294).

18520379578 is a wasteful number, since it uses less digits than its factorization.

18520379578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776836.

The product of its (nonzero) digits is 4233600, while the sum is 55.

The spelling of 18520379578 in words is "eighteen billion, five hundred twenty million, three hundred seventy-nine thousand, five hundred seventy-eight".