8211666461 has 2 divisors, whose sum is σ = 8211666462. Its totient is φ = 8211666460.

The previous prime is 8211666439. The next prime is 8211666467. The reversal of 8211666461 is 1646661128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8202019225 + 9647236 = 90565^2 + 3106^2 .

It is a cyclic number.

It is not a de Polignac number, because 8211666461 - 2¹⁰ = 8211665437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8211666467) 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, 4105833230 + 4105833231.

It is an arithmetic number, because the mean of its divisors is an integer number (4105833231).

Almost surely, 2^8211666461 is an apocalyptic number.

It is an amenable number.

8211666461 is a deficient number, since it is larger than the sum of its proper divisors (1).

8211666461 is an equidigital number, since it uses as much as digits as its factorization.

8211666461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 8211666461 is about 90618.2457400274. The cubic root of 8211666461 is about 2017.4855539422.

The spelling of 8211666461 in words is "eight billion, two hundred eleven million, six hundred sixty-six thousand, four hundred sixty-one".