3867368646721 has 2 divisors, whose sum is σ = 3867368646722. Its totient is φ = 3867368646720.

The previous prime is 3867368646719. The next prime is 3867368646833. The reversal of 3867368646721 is 1276468637683.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3076905400321 + 790463246400 = 1754111^2 + 889080^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867368646721 - 2¹ = 3867368646719 is a prime.

Together with 3867368646719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3867368616721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933684323360 + 1933684323361.

It is an arithmetic number, because the mean of its divisors is an integer number (1933684323361).

Almost surely, 2^{3867368646721} is an apocalyptic number.

It is an amenable number.

3867368646721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867368646721 is an equidigital number, since it uses as much as digits as its factorization.

3867368646721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 292626432, while the sum is 67.

The spelling of 3867368646721 in words is "three trillion, eight hundred sixty-seven billion, three hundred sixty-eight million, six hundred forty-six thousand, seven hundred twenty-one".