16785683173997 has 2 divisors, whose sum is σ = 16785683173998. Its totient is φ = 16785683173996.

The previous prime is 16785683173979. The next prime is 16785683174009. The reversal of 16785683173997 is 79937138658761.

Together with previous prime (16785683173979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15827817739561 + 957865434436 = 3978419^2 + 978706^2 .

It is a cyclic number.

It is not a de Polignac number, because 16785683173997 - 2¹⁸ = 16785682911853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16785683173957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8392841586998 + 8392841586999.

It is an arithmetic number, because the mean of its divisors is an integer number (8392841586999).

Almost surely, 2^{16785683173997} is an apocalyptic number.

It is an amenable number.

16785683173997 is a deficient number, since it is larger than the sum of its proper divisors (1).

16785683173997 is an equidigital number, since it uses as much as digits as its factorization.

16785683173997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880541440, while the sum is 80.

The spelling of 16785683173997 in words is "sixteen trillion, seven hundred eighty-five billion, six hundred eighty-three million, one hundred seventy-three thousand, nine hundred ninety-seven".