16868558009 has 2 divisors, whose sum is σ = 16868558010. Its totient is φ = 16868558008.

The previous prime is 16868557991. The next prime is 16868558033. The reversal of 16868558009 is 90085586861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15812308009 + 1056250000 = 125747^2 + 32500^2 .

It is a cyclic number.

It is not a de Polignac number, because 16868558009 - 2²⁴ = 16851780793 is a prime.

It is not a weakly prime, because it can be changed into another prime (16868558039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8434279004 + 8434279005.

It is an arithmetic number, because the mean of its divisors is an integer number (8434279005).

Almost surely, 2^16868558009 is an apocalyptic number.

It is an amenable number.

16868558009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16868558009 is an equidigital number, since it uses as much as digits as its factorization.

16868558009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4147200, while the sum is 56.

The spelling of 16868558009 in words is "sixteen billion, eight hundred sixty-eight million, five hundred fifty-eight thousand, nine".