999998566681223 has 2 divisors, whose sum is σ = 999998566681224. Its totient is φ = 999998566681222.

The previous prime is 999998566681069. The next prime is 999998566681253. The reversal of 999998566681223 is 322186665899999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999998566681223 - 2²² = 999998562486919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998566681253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999283340611 + 499999283340612.

It is an arithmetic number, because the mean of its divisors is an integer number (499999283340612).

Almost surely, 2^{999998566681223} is an apocalyptic number.

999998566681223 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998566681223 is an equidigital number, since it uses as much as digits as its factorization.

999998566681223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48977602560, while the sum is 92.

The spelling of 999998566681223 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, five hundred sixty-six million, six hundred eighty-one thousand, two hundred twenty-three".