3666663 has 72 divisors (see below), whose sum is σ = 7358624. Its totient is φ = 1710720.

The previous prime is 3666661. The next prime is 3666703.

3666663 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3666663 - 2¹ = 3666661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666661) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 99081 + ... + 99117.

Almost surely, 2^3666663 is an apocalyptic number.

3666663 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

3666663 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

3666663 is a wasteful number, since it uses less digits than its factorization.

3666663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 71 counting only the distinct ones).

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

The square root of 3666663 is about 1914.8532580853. The cubic root of 3666663 is about 154.2021155720.

It can be divided in two parts, 3 and 666663, that added together give a palindrome (666666).

The spelling of 3666663 in words is "three million, six hundred sixty-six thousand, six hundred sixty-three".