999999888666673 has 2 divisors, whose sum is σ = 999999888666674. Its totient is φ = 999999888666672.

The previous prime is 999999888666637. The next prime is 999999888666683. The reversal of 999999888666673 is 376666888999999.

Together with previous prime (999999888666637) 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., 986618756398144 + 13381132268529 = 31410488^2 + 3658023^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999888666673 - 2⁹ = 999999888666161 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999888666683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999944333336 + 499999944333337.

It is an arithmetic number, because the mean of its divisors is an integer number (499999944333337).

Almost surely, 2^{999999888666673} is an apocalyptic number.

It is an amenable number.

999999888666673 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999888666673 is an equidigital number, since it uses as much as digits as its factorization.

999999888666673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7405413507072, while the sum is 112.

The spelling of 999999888666673 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, eight hundred eighty-eight million, six hundred sixty-six thousand, six hundred seventy-three".