3681368861 has 2 divisors, whose sum is σ = 3681368862. Its totient is φ = 3681368860.

The previous prime is 3681368851. The next prime is 3681368869. The reversal of 3681368861 is 1688631863.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3206956900 + 474411961 = 56630^2 + 21781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3681368861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3681368869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1840684430 + 1840684431.

It is an arithmetic number, because the mean of its divisors is an integer number (1840684431).

Almost surely, 2^3681368861 is an apocalyptic number.

It is an amenable number.

3681368861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3681368861 is an equidigital number, since it uses as much as digits as its factorization.

3681368861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The square root of 3681368861 is about 60674.2850060880. The cubic root of 3681368861 is about 1544.0799304744.

The spelling of 3681368861 in words is "three billion, six hundred eighty-one million, three hundred sixty-eight thousand, eight hundred sixty-one".