3665599566 has 16 divisors (see below), whose sum is σ = 7375100544. Its totient is φ = 1214549624.

The previous prime is 3665599541. The next prime is 3665599577. The reversal of 3665599566 is 6659955663.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1828140 + ... + 1830143.

It is an arithmetic number, because the mean of its divisors is an integer number (460943784).

Almost surely, 2^3665599566 is an apocalyptic number.

3665599566 is an abundant number, since it is smaller than the sum of its proper divisors (3709500978).

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

3665599566 is a wasteful number, since it uses less digits than its factorization.

3665599566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658455.

The product of its digits is 39366000, while the sum is 60.

The square root of 3665599566 is about 60544.1951470164. The cubic root of 3665599566 is about 1541.8720649998.

The spelling of 3665599566 in words is "three billion, six hundred sixty-five million, five hundred ninety-nine thousand, five hundred sixty-six".