3665635985 has 32 divisors (see below), whose sum is σ = 4933730304. Its totient is φ = 2591640000.

The previous prime is 3665635949. The next prime is 3665635993. The reversal of 3665635985 is 5895365663.

It is not a de Polignac number, because 3665635985 - 2¹⁰ = 3665634961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3665635985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385640 + ... + 395030.

It is an arithmetic number, because the mean of its divisors is an integer number (154179072).

Almost surely, 2^3665635985 is an apocalyptic number.

It is an amenable number.

3665635985 is a deficient number, since it is larger than the sum of its proper divisors (1268094319).

3665635985 is a wasteful number, since it uses less digits than its factorization.

3665635985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9605.

The product of its digits is 17496000, while the sum is 56.

The square root of 3665635985 is about 60544.4959100330. The cubic root of 3665635985 is about 1541.8771713271.

The spelling of 3665635985 in words is "three billion, six hundred sixty-five million, six hundred thirty-five thousand, nine hundred eighty-five".