1666846666 has 8 divisors (see below), whose sum is σ = 2500815744. Its totient is φ = 833241420.

The previous prime is 1666846619. The next prime is 1666846667. The reversal of 1666846666 is 6666486661.

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 (1666846667) 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, 79200 + ... + 98011.

It is an arithmetic number, because the mean of its divisors is an integer number (312601968).

Almost surely, 2^1666846666 is an apocalyptic number.

1666846666 is a deficient number, since it is larger than the sum of its proper divisors (833969078).

1666846666 is a wasteful number, since it uses less digits than its factorization.

1666846666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181916.

The product of its digits is 8957952, while the sum is 55.

The square root of 1666846666 is about 40827.0335194709. The cubic root of 1666846666 is about 1185.6737825218.

The spelling of 1666846666 in words is "one billion, six hundred sixty-six million, eight hundred forty-six thousand, six hundred sixty-six".