3821681663 has 2 divisors, whose sum is σ = 3821681664. Its totient is φ = 3821681662.

The previous prime is 3821681639. The next prime is 3821681671. The reversal of 3821681663 is 3661861283.

It is a strong prime.

It is an emirp because it is prime and its reverse (3661861283) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3821681663 - 2³⁰ = 2747939839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3821681063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910840831 + 1910840832.

It is an arithmetic number, because the mean of its divisors is an integer number (1910840832).

Almost surely, 2^3821681663 is an apocalyptic number.

3821681663 is a deficient number, since it is larger than the sum of its proper divisors (1).

3821681663 is an equidigital number, since it uses as much as digits as its factorization.

3821681663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 3821681663 is about 61819.7513987237. The cubic root of 3821681663 is about 1563.4530216566.

The spelling of 3821681663 in words is "three billion, eight hundred twenty-one million, six hundred eighty-one thousand, six hundred sixty-three".