3681105661 has 2 divisors, whose sum is σ = 3681105662. Its totient is φ = 3681105660.

The previous prime is 3681105653. The next prime is 3681105697. The reversal of 3681105661 is 1665011863.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3526103161 + 155002500 = 59381^2 + 12450^2 .

It is an emirp because it is prime and its reverse (1665011863) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3681105661 - 2³ = 3681105653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3681105661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3681105611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1840552830 + 1840552831.

It is an arithmetic number, because the mean of its divisors is an integer number (1840552831).

Almost surely, 2^3681105661 is an apocalyptic number.

It is an amenable number.

3681105661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3681105661 is an equidigital number, since it uses as much as digits as its factorization.

3681105661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 3681105661 is about 60672.1160089213. The cubic root of 3681105661 is about 1544.0431315246.

The spelling of 3681105661 in words is "three billion, six hundred eighty-one million, one hundred five thousand, six hundred sixty-one".