3689705666 has 8 divisors (see below), whose sum is σ = 5535022140. Its totient is φ = 1844698288.

The previous prime is 3689705647. The next prime is 3689705671. The reversal of 3689705666 is 6665079863.

It can be written as a sum of positive squares in 2 ways, for example, as 3627532441 + 62173225 = 60229^2 + 7885^2 .

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

It is a super-2 number, since 2×3689705666² = 27227855803425007112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44681 + ... + 96828.

Almost surely, 2^3689705666 is an apocalyptic number.

3689705666 is a deficient number, since it is larger than the sum of its proper divisors (1845316474).

3689705666 is a wasteful number, since it uses less digits than its factorization.

3689705666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154548.

The product of its (nonzero) digits is 9797760, while the sum is 56.

The square root of 3689705666 is about 60742.9474589437. The cubic root of 3689705666 is about 1545.2446229966.

The spelling of 3689705666 in words is "three billion, six hundred eighty-nine million, seven hundred five thousand, six hundred sixty-six".