18521943466 has 16 divisors (see below), whose sum is σ = 30076720128. Its totient is φ = 8503830000.

The previous prime is 18521943389. The next prime is 18521943491. The reversal of 18521943466 is 66434912581.

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, 1859910 + ... + 1869841.

It is an arithmetic number, because the mean of its divisors is an integer number (1879795008).

Almost surely, 2^18521943466 is an apocalyptic number.

18521943466 is a deficient number, since it is larger than the sum of its proper divisors (11554776662).

18521943466 is a wasteful number, since it uses less digits than its factorization.

18521943466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3729957.

The product of its digits is 1244160, while the sum is 49.

The spelling of 18521943466 in words is "eighteen billion, five hundred twenty-one million, nine hundred forty-three thousand, four hundred sixty-six".