3665005666 has 24 divisors (see below), whose sum is σ = 6398300160. Its totient is φ = 1569921192.

The previous prime is 3665005649. The next prime is 3665005693. The reversal of 3665005666 is 6665005663.

It is a happy number.

3665005666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211071 + ... + 227773.

It is an arithmetic number, because the mean of its divisors is an integer number (266595840).

Almost surely, 2^3665005666 is an apocalyptic number.

3665005666 is a deficient number, since it is larger than the sum of its proper divisors (2733294494).

3665005666 is a wasteful number, since it uses less digits than its factorization.

3665005666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18958 (or 18951 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 43.

The square root of 3665005666 is about 60539.2902667350. The cubic root of 3665005666 is about 1541.7887891935.

The spelling of 3665005666 in words is "three billion, six hundred sixty-five million, five thousand, six hundred sixty-six".