12428321666 has 8 divisors (see below), whose sum is σ = 18765943104. Its totient is φ = 6173007300.

The previous prime is 12428321573. The next prime is 12428321687. The reversal of 12428321666 is 66612382421.

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, 20576390 + ... + 20576993.

It is an arithmetic number, because the mean of its divisors is an integer number (2345742888).

Almost surely, 2^12428321666 is an apocalyptic number.

12428321666 is a deficient number, since it is larger than the sum of its proper divisors (6337621438).

12428321666 is a wasteful number, since it uses less digits than its factorization.

12428321666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41153536.

The product of its digits is 165888, while the sum is 41.

The spelling of 12428321666 in words is "twelve billion, four hundred twenty-eight million, three hundred twenty-one thousand, six hundred sixty-six".