41441821661 has 2 divisors, whose sum is σ = 41441821662. Its totient is φ = 41441821660.

The previous prime is 41441821627. The next prime is 41441821679. The reversal of 41441821661 is 16612814414.

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., 39487651225 + 1954170436 = 198715^2 + 44206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41441821661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41441820661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20720910830 + 20720910831.

It is an arithmetic number, because the mean of its divisors is an integer number (20720910831).

Almost surely, 2^41441821661 is an apocalyptic number.

It is an amenable number.

41441821661 is a deficient number, since it is larger than the sum of its proper divisors (1).

41441821661 is an equidigital number, since it uses as much as digits as its factorization.

41441821661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 38.

The spelling of 41441821661 in words is "forty-one billion, four hundred forty-one million, eight hundred twenty-one thousand, six hundred sixty-one".