39681843863 has 2 divisors, whose sum is σ = 39681843864. Its totient is φ = 39681843862.

The previous prime is 39681843829. The next prime is 39681843889. The reversal of 39681843863 is 36834818693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39681843863 - 2¹² = 39681839767 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39681843823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19840921931 + 19840921932.

It is an arithmetic number, because the mean of its divisors is an integer number (19840921932).

Almost surely, 2^39681843863 is an apocalyptic number.

39681843863 is a deficient number, since it is larger than the sum of its proper divisors (1).

39681843863 is an equidigital number, since it uses as much as digits as its factorization.

39681843863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17915904, while the sum is 59.

The spelling of 39681843863 in words is "thirty-nine billion, six hundred eighty-one million, eight hundred forty-three thousand, eight hundred sixty-three".