18881264666 has 8 divisors (see below), whose sum is σ = 30896614944. Its totient is φ = 8582393020.

The previous prime is 18881264629. The next prime is 18881264671. The reversal of 18881264666 is 66646218881.

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, 429119630 + ... + 429119673.

It is an arithmetic number, because the mean of its divisors is an integer number (3862076868).

Almost surely, 2^18881264666 is an apocalyptic number.

18881264666 is a deficient number, since it is larger than the sum of its proper divisors (12015350278).

18881264666 is a wasteful number, since it uses less digits than its factorization.

18881264666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858239316.

The product of its digits is 5308416, while the sum is 56.

The spelling of 18881264666 in words is "eighteen billion, eight hundred eighty-one million, two hundred sixty-four thousand, six hundred sixty-six".