8247777641 has 2 divisors, whose sum is σ = 8247777642. Its totient is φ = 8247777640.

The previous prime is 8247777617. The next prime is 8247777661. The reversal of 8247777641 is 1467777428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5670692416 + 2577085225 = 75304^2 + 50765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8247777641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8247777661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4123888820 + 4123888821.

It is an arithmetic number, because the mean of its divisors is an integer number (4123888821).

Almost surely, 2^8247777641 is an apocalyptic number.

It is an amenable number.

8247777641 is a deficient number, since it is larger than the sum of its proper divisors (1).

8247777641 is an equidigital number, since it uses as much as digits as its factorization.

8247777641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3687936, while the sum is 53.

The square root of 8247777641 is about 90817.2761152855. The cubic root of 8247777641 is about 2020.4385579336.

The spelling of 8247777641 in words is "eight billion, two hundred forty-seven million, seven hundred seventy-seven thousand, six hundred forty-one".