8636861311009 has 2 divisors, whose sum is σ = 8636861311010. Its totient is φ = 8636861311008.

The previous prime is 8636861311003. The next prime is 8636861311073. The reversal of 8636861311009 is 9001131686368.

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., 7645761419409 + 991099891600 = 2765097^2 + 995540^2 .

It is a cyclic number.

It is not a de Polignac number, because 8636861311009 - 2²⁹ = 8636324440097 is a prime.

It is not a weakly prime, because it can be changed into another prime (8636861311003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4318430655504 + 4318430655505.

It is an arithmetic number, because the mean of its divisors is an integer number (4318430655505).

Almost surely, 2^{8636861311009} is an apocalyptic number.

It is an amenable number.

8636861311009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8636861311009 is an equidigital number, since it uses as much as digits as its factorization.

8636861311009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 8636861311009 in words is "eight trillion, six hundred thirty-six billion, eight hundred sixty-one million, three hundred eleven thousand, nine".