41686801661 has 2 divisors, whose sum is σ = 41686801662. Its totient is φ = 41686801660.

The previous prime is 41686801649. The next prime is 41686801679. The reversal of 41686801661 is 16610868614.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23324925625 + 18361876036 = 152725^2 + 135506^2 .

It is a cyclic number.

It is not a de Polignac number, because 41686801661 - 2¹⁴ = 41686785277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41686806661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20843400830 + 20843400831.

It is an arithmetic number, because the mean of its divisors is an integer number (20843400831).

Almost surely, 2^41686801661 is an apocalyptic number.

It is an amenable number.

41686801661 is a deficient number, since it is larger than the sum of its proper divisors (1).

41686801661 is an equidigital number, since it uses as much as digits as its factorization.

41686801661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 41686801661 in words is "forty-one billion, six hundred eighty-six million, eight hundred one thousand, six hundred sixty-one".