18909473578 has 8 divisors (see below), whose sum is σ = 28365094368. Its totient is φ = 9454442124.

The previous prime is 18909473573. The next prime is 18909473591. The reversal of 18909473578 is 87537490981.

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 (18909473573) 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, 55726 + ... + 202297.

It is an arithmetic number, because the mean of its divisors is an integer number (3545636796).

Almost surely, 2^18909473578 is an apocalyptic number.

18909473578 is a deficient number, since it is larger than the sum of its proper divisors (9455620790).

18909473578 is a wasteful number, since it uses less digits than its factorization.

18909473578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294668.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 18909473578 in words is "eighteen billion, nine hundred nine million, four hundred seventy-three thousand, five hundred seventy-eight".