3666555 has 24 divisors (see below), whose sum is σ = 6467760. Its totient is φ = 1920960.

The previous prime is 3666539. The next prime is 3666581. The reversal of 3666555 is 5556663.

It is a happy number.

It is not a de Polignac number, because 3666555 - 2⁴ = 3666539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1965 + ... + 3345.

It is an arithmetic number, because the mean of its divisors is an integer number (269490).

Almost surely, 2^3666555 is an apocalyptic number.

3666555 is a deficient number, since it is larger than the sum of its proper divisors (2801205).

3666555 is a wasteful number, since it uses less digits than its factorization.

3666555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451 (or 1448 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 3666555 is about 1914.8250572833. The cubic root of 3666555 is about 154.2006015712.

The spelling of 3666555 in words is "three million, six hundred sixty-six thousand, five hundred fifty-five".