3867667681 has 2 divisors, whose sum is σ = 3867667682. Its totient is φ = 3867667680.

The previous prime is 3867667673. The next prime is 3867667691. The reversal of 3867667681 is 1867667683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3819240000 + 48427681 = 61800^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867667681 - 2³ = 3867667673 is a prime.

It is a super-2 number, since 2×3867667681² = 29917706581303835522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3867667631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933833840 + 1933833841.

It is an arithmetic number, because the mean of its divisors is an integer number (1933833841).

Almost surely, 2^3867667681 is an apocalyptic number.

It is an amenable number.

3867667681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867667681 is an equidigital number, since it uses as much as digits as its factorization.

3867667681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 58.

The square root of 3867667681 is about 62190.5754998296. The cubic root of 3867667681 is about 1569.6990079813.

The spelling of 3867667681 in words is "three billion, eight hundred sixty-seven million, six hundred sixty-seven thousand, six hundred eighty-one".