6669889666 has 16 divisors (see below), whose sum is σ = 10915619328. Its totient is φ = 3031419600.

The previous prime is 6669889663. The next prime is 6669889697.

6669889666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6669889666² = 88974856313227183112, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6669889595 and 6669889604.

It is not an unprimeable number, because it can be changed into a prime (6669889663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361276 + ... + 379288.

It is an arithmetic number, because the mean of its divisors is an integer number (682226208).

Almost surely, 2^6669889666 is an apocalyptic number.

6669889666 is a deficient number, since it is larger than the sum of its proper divisors (4245729662).

6669889666 is a wasteful number, since it uses less digits than its factorization.

6669889666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34857.

The product of its digits is 241864704, while the sum is 70.

The square root of 6669889666 is about 81669.3924674354. The cubic root of 6669889666 is about 1882.3753047484.

The spelling of 6669889666 in words is "six billion, six hundred sixty-nine million, eight hundred eighty-nine thousand, six hundred sixty-six".