3663666 has 24 divisors (see below), whose sum is σ = 8153964. Its totient is φ = 1188000.

The previous prime is 3663661. The next prime is 3663689. The reversal of 3663666 is 6663663.

It can be written as a sum of positive squares in 2 ways, for example, as 2653641 + 1010025 = 1629^2 + 1005^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 3663666.

It is not an unprimeable number, because it can be changed into a prime (3663661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2085 + ... + 3416.

Almost surely, 2^3663666 is an apocalyptic number.

3663666 is an abundant number, since it is smaller than the sum of its proper divisors (4490298).

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

3663666 is a wasteful number, since it uses less digits than its factorization.

3663666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546 (or 5543 counting only the distinct ones).

The product of its digits is 69984, while the sum is 36.

The square root of 3663666 is about 1914.0705316158. The cubic root of 3663666 is about 154.1600910108.

The spelling of 3663666 in words is "three million, six hundred sixty-three thousand, six hundred sixty-six".