3666363021 has 40 divisors (see below), whose sum is σ = 5810485824. Its totient is φ = 2295941760.

The previous prime is 3666363017. The next prime is 3666363037. The reversal of 3666363021 is 1203636663.

It is a happy number.

It is not a de Polignac number, because 3666363021 - 2² = 3666363017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666363091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 783936 + ... + 788598.

Almost surely, 2^3666363021 is an apocalyptic number.

It is an amenable number.

3666363021 is a deficient number, since it is larger than the sum of its proper divisors (2144122803).

3666363021 is a wasteful number, since it uses less digits than its factorization.

3666363021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263 (or 5254 counting only the distinct ones).

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

The square root of 3666363021 is about 60550.4997584661. The cubic root of 3666363021 is about 1541.9791023527.

Adding to 3666363021 its reverse (1203636663), we get a palindrome (4869999684).

The spelling of 3666363021 in words is "three billion, six hundred sixty-six million, three hundred sixty-three thousand, twenty-one".