3936821986633 has 2 divisors, whose sum is σ = 3936821986634. Its totient is φ = 3936821986632.

The previous prime is 3936821986529. The next prime is 3936821986661. The reversal of 3936821986633 is 3366891286393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3713648888889 + 223173097744 = 1927083^2 + 472412^2 .

It is a cyclic number.

It is not a de Polignac number, because 3936821986633 - 2⁹ = 3936821986121 is a prime.

It is not a weakly prime, because it can be changed into another prime (3936821986133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1968410993316 + 1968410993317.

It is an arithmetic number, because the mean of its divisors is an integer number (1968410993317).

Almost surely, 2^{3936821986633} is an apocalyptic number.

It is an amenable number.

3936821986633 is a deficient number, since it is larger than the sum of its proper divisors (1).

3936821986633 is an equidigital number, since it uses as much as digits as its factorization.

3936821986633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181398528, while the sum is 67.

The spelling of 3936821986633 in words is "three trillion, nine hundred thirty-six billion, eight hundred twenty-one million, nine hundred eighty-six thousand, six hundred thirty-three".