3665445664 has 24 divisors (see below), whose sum is σ = 7226237340. Its totient is φ = 1830210816.

The previous prime is 3665445601. The next prime is 3665445671. The reversal of 3665445664 is 4665445663.

It can be written as a sum of positive squares in 2 ways, for example, as 3565045264 + 100400400 = 59708^2 + 10020^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54679 + ... + 101590.

Almost surely, 2^3665445664 is an apocalyptic number.

It is an amenable number.

3665445664 is a deficient number, since it is larger than the sum of its proper divisors (3560791676).

3665445664 is a wasteful number, since it uses less digits than its factorization.

3665445664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157012 (or 157004 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 49.

The square root of 3665445664 is about 60542.9241447752. The cubic root of 3665445664 is about 1541.8504859456.

Subtracting 3665445664 from its reverse (4665445663), we obtain a palindrome (999999999).

The spelling of 3665445664 in words is "three billion, six hundred sixty-five million, four hundred forty-five thousand, six hundred sixty-four".