841695661 has 2 divisors, whose sum is σ = 841695662. Its totient is φ = 841695660.

The previous prime is 841695643. The next prime is 841695667. The reversal of 841695661 is 166596148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635342436 + 206353225 = 25206^2 + 14365^2 .

It is a cyclic number.

It is not a de Polignac number, because 841695661 - 2⁹ = 841695149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (841695667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420847830 + 420847831.

It is an arithmetic number, because the mean of its divisors is an integer number (420847831).

Almost surely, 2^841695661 is an apocalyptic number.

It is an amenable number.

841695661 is a deficient number, since it is larger than the sum of its proper divisors (1).

841695661 is an equidigital number, since it uses as much as digits as its factorization.

841695661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 841695661 is about 29011.9916758571. The cubic root of 841695661 is about 944.1732589945.

The spelling of 841695661 in words is "eight hundred forty-one million, six hundred ninety-five thousand, six hundred sixty-one".