18882521666 has 8 divisors (see below), whose sum is σ = 28424579724. Its totient is φ = 9407661760.

The previous prime is 18882521657. The next prime is 18882521687. The reversal of 18882521666 is 66612528881.

It can be written as a sum of positive squares in 2 ways, for example, as 15408008641 + 3474513025 = 124129^2 + 58945^2 .

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

It is a Curzon number.

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, 16798835 + ... + 16799958.

Almost surely, 2^18882521666 is an apocalyptic number.

18882521666 is a deficient number, since it is larger than the sum of its proper divisors (9542058058).

18882521666 is a wasteful number, since it uses less digits than its factorization.

18882521666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33599076.

The product of its digits is 2211840, while the sum is 53.

The spelling of 18882521666 in words is "eighteen billion, eight hundred eighty-two million, five hundred twenty-one thousand, six hundred sixty-six".