3664671666 has 8 divisors (see below), whose sum is σ = 7329343344. Its totient is φ = 1221557220.

The previous prime is 3664671649. The next prime is 3664671713. The reversal of 3664671666 is 6661764663.

It is a happy number.

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

3664671666 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305389300 + ... + 305389311.

It is an arithmetic number, because the mean of its divisors is an integer number (916167918).

Almost surely, 2^3664671666 is an apocalyptic number.

3664671666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

3664671666 is a wasteful number, since it uses less digits than its factorization.

3664671666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610778616.

The product of its digits is 3919104, while the sum is 51.

The square root of 3664671666 is about 60536.5316647725. The cubic root of 3664671666 is about 1541.7419522400.

The spelling of 3664671666 in words is "three billion, six hundred sixty-four million, six hundred seventy-one thousand, six hundred sixty-six".