16866825317 has 2 divisors, whose sum is σ = 16866825318. Its totient is φ = 16866825316.

The previous prime is 16866825277. The next prime is 16866825319. The reversal of 16866825317 is 71352866861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15927954436 + 938870881 = 126206^2 + 30641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16866825317 is a prime.

Together with 16866825319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16866825319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8433412658 + 8433412659.

It is an arithmetic number, because the mean of its divisors is an integer number (8433412659).

Almost surely, 2^16866825317 is an apocalyptic number.

It is an amenable number.

16866825317 is a deficient number, since it is larger than the sum of its proper divisors (1).

16866825317 is an equidigital number, since it uses as much as digits as its factorization.

16866825317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The spelling of 16866825317 in words is "sixteen billion, eight hundred sixty-six million, eight hundred twenty-five thousand, three hundred seventeen".