3646683781665 has 16 divisors (see below), whose sum is σ = 5856384369600. Its totient is φ = 1937667910592.

The previous prime is 3646683781619. The next prime is 3646683781667. The reversal of 3646683781665 is 5661873866463.

It is a cyclic number.

It is not a de Polignac number, because 3646683781665 - 2⁸ = 3646683781409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3646683781665.

It is not an unprimeable number, because it can be changed into a prime (3646683781667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451877475 + ... + 451885544.

It is an arithmetic number, because the mean of its divisors is an integer number (366024023100).

Almost surely, 2^{3646683781665} is an apocalyptic number.

It is an amenable number.

3646683781665 is a deficient number, since it is larger than the sum of its proper divisors (2209700587935).

3646683781665 is a wasteful number, since it uses less digits than its factorization.

3646683781665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903763296.

The product of its digits is 627056640, while the sum is 69.

The spelling of 3646683781665 in words is "three trillion, six hundred forty-six billion, six hundred eighty-three million, seven hundred eighty-one thousand, six hundred sixty-five".