3643581685 has 16 divisors (see below), whose sum is σ = 4567809024. Its totient is φ = 2784825472.

The previous prime is 3643581671. The next prime is 3643581703. The reversal of 3643581685 is 5861853463.

It is a cyclic number.

It is not a de Polignac number, because 3643581685 - 2²³ = 3635193077 is a prime.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 80889 + ... + 117601.

It is an arithmetic number, because the mean of its divisors is an integer number (285488064).

Almost surely, 2^3643581685 is an apocalyptic number.

It is an amenable number.

3643581685 is a deficient number, since it is larger than the sum of its proper divisors (924227339).

3643581685 is a wasteful number, since it uses less digits than its factorization.

3643581685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37604.

The product of its digits is 2073600, while the sum is 49.

The square root of 3643581685 is about 60362.0881431383. The cubic root of 3643581685 is about 1538.7787142171.

The spelling of 3643581685 in words is "three billion, six hundred forty-three million, five hundred eighty-one thousand, six hundred eighty-five".