999888888673 has 2 divisors, whose sum is σ = 999888888674. Its totient is φ = 999888888672.

The previous prime is 999888888619. The next prime is 999888888679. The reversal of 999888888673 is 376888888999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 695727814609 + 304161074064 = 834103^2 + 551508^2 .

It is a cyclic number.

It is not a de Polignac number, because 999888888673 - 2²¹ = 999886791521 is a prime.

It is not a weakly prime, because it can be changed into another prime (999888888679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499944444336 + 499944444337.

It is an arithmetic number, because the mean of its divisors is an integer number (499944444337).

Almost surely, 2^999888888673 is an apocalyptic number.

It is an amenable number.

999888888673 is a deficient number, since it is larger than the sum of its proper divisors (1).

999888888673 is an equidigital number, since it uses as much as digits as its factorization.

999888888673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24078974976, while the sum is 91.

The spelling of 999888888673 in words is "nine hundred ninety-nine billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred seventy-three".