3867368616721 has 2 divisors, whose sum is σ = 3867368616722. Its totient is φ = 3867368616720.

The previous prime is 3867368616653. The next prime is 3867368616767. The reversal of 3867368616721 is 1276168637683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2659952236096 + 1207416380625 = 1630936^2 + 1098825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3867368616721 is a prime.

It is not a weakly prime, because it can be changed into another prime (3867368646721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933684308360 + 1933684308361.

It is an arithmetic number, because the mean of its divisors is an integer number (1933684308361).

Almost surely, 2^{3867368616721} is an apocalyptic number.

It is an amenable number.

3867368616721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867368616721 is an equidigital number, since it uses as much as digits as its factorization.

3867368616721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73156608, while the sum is 64.

The spelling of 3867368616721 in words is "three trillion, eight hundred sixty-seven billion, three hundred sixty-eight million, six hundred sixteen thousand, seven hundred twenty-one".