8501564993 has 2 divisors, whose sum is σ = 8501564994. Its totient is φ = 8501564992.

The previous prime is 8501564987. The next prime is 8501565001. The reversal of 8501564993 is 3994651058.

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., 5221941169 + 3279623824 = 72263^2 + 57268^2 .

It is a cyclic number.

It is not a de Polignac number, because 8501564993 - 2¹² = 8501560897 is a prime.

It is not a weakly prime, because it can be changed into another prime (8501564933) 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, 4250782496 + 4250782497.

It is an arithmetic number, because the mean of its divisors is an integer number (4250782497).

Almost surely, 2^8501564993 is an apocalyptic number.

It is an amenable number.

8501564993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8501564993 is an equidigital number, since it uses as much as digits as its factorization.

8501564993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 8501564993 is about 92203.9315484974. The cubic root of 8501564993 is about 2040.9527935013.

The spelling of 8501564993 in words is "eight billion, five hundred one million, five hundred sixty-four thousand, nine hundred ninety-three".