3663666663647 has 2 divisors, whose sum is σ = 3663666663648. Its totient is φ = 3663666663646.

The previous prime is 3663666663607. The next prime is 3663666663721. The reversal of 3663666663647 is 7463666663663.

3663666663647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3663666663647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3663666663607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1831833331823 + 1831833331824.

It is an arithmetic number, because the mean of its divisors is an integer number (1831833331824).

Almost surely, 2^{3663666663647} is an apocalyptic number.

3663666663647 is a deficient number, since it is larger than the sum of its proper divisors (1).

3663666663647 is an equidigital number, since it uses as much as digits as its factorization.

3663666663647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1269789696, while the sum is 68.

The spelling of 3663666663647 in words is "three trillion, six hundred sixty-three billion, six hundred sixty-six million, six hundred sixty-three thousand, six hundred forty-seven".