6642666 has 24 divisors (see below), whose sum is σ = 15150720. Its totient is φ = 2097576.

The previous prime is 6642659. The next prime is 6642707. The reversal of 6642666 is 6662466.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6642666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9370 + ... + 10053.

It is an arithmetic number, because the mean of its divisors is an integer number (631280).

Almost surely, 2^6642666 is an apocalyptic number.

6642666 is an abundant number, since it is smaller than the sum of its proper divisors (8508054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6642666 is a wasteful number, since it uses less digits than its factorization.

6642666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19450 (or 19447 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 6642666 is about 2577.3369977556. The cubic root of 6642666 is about 187.9810792789.

The spelling of 6642666 in words is "six million, six hundred forty-two thousand, six hundred sixty-six".