6665995666 has 8 divisors (see below), whose sum is σ = 10907992944. Its totient is φ = 3029998020.

The previous prime is 6665995649. The next prime is 6665995667.

6665995666 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 6665995598 and 6665995607.

It is not an unprimeable number, because it can be changed into a prime (6665995667) 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, 151499880 + ... + 151499923.

It is an arithmetic number, because the mean of its divisors is an integer number (1363499118).

Almost surely, 2^6665995666 is an apocalyptic number.

6665995666 is a deficient number, since it is larger than the sum of its proper divisors (4241997278).

6665995666 is a wasteful number, since it uses less digits than its factorization.

6665995666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302999816.

The product of its digits is 94478400, while the sum is 64.

The square root of 6665995666 is about 81645.5489662480. The cubic root of 6665995666 is about 1882.0089120632.

The spelling of 6665995666 in words is "six billion, six hundred sixty-five million, nine hundred ninety-five thousand, six hundred sixty-six".