6664884666 has 64 divisors (see below), whose sum is σ = 14952677760. Its totient is φ = 1962696960.

The previous prime is 6664884617. The next prime is 6664884701.

It is a happy number.

6664884666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6664884666² = 88841375222163863112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3899020 + ... + 3900728.

It is an arithmetic number, because the mean of its divisors is an integer number (233635590).

Almost surely, 2^6664884666 is an apocalyptic number.

6664884666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664884666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7476338880).

6664884666 is an abundant number, since it is smaller than the sum of its proper divisors (8287793094).

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

6664884666 is a wasteful number, since it uses less digits than its factorization.

6664884666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359.

The product of its digits is 47775744, while the sum is 60.

The square root of 6664884666 is about 81638.7448825617. The cubic root of 6664884666 is about 1881.9043501353.

The spelling of 6664884666 in words is "six billion, six hundred sixty-four million, eight hundred eighty-four thousand, six hundred sixty-six".