8543851661 has 2 divisors, whose sum is σ = 8543851662. Its totient is φ = 8543851660.

The previous prime is 8543851583. The next prime is 8543851703. The reversal of 8543851661 is 1661583458.

8543851661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8175595561 + 368256100 = 90419^2 + 19190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8543851661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8543851861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4271925830 + 4271925831.

It is an arithmetic number, because the mean of its divisors is an integer number (4271925831).

Almost surely, 2^8543851661 is an apocalyptic number.

It is an amenable number.

8543851661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8543851661 is an equidigital number, since it uses as much as digits as its factorization.

8543851661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 47.

The square root of 8543851661 is about 92432.9576558059. The cubic root of 8543851661 is about 2044.3310889057.

The spelling of 8543851661 in words is "eight billion, five hundred forty-three million, eight hundred fifty-one thousand, six hundred sixty-one".