999999729328723 has 2 divisors, whose sum is σ = 999999729328724. Its totient is φ = 999999729328722.

The previous prime is 999999729328711. The next prime is 999999729328729. The reversal of 999999729328723 is 327823927999999.

999999729328723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (327823927999999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999729328723 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999729328729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999864664361 + 499999864664362.

It is an arithmetic number, because the mean of its divisors is an integer number (499999864664362).

Almost surely, 2^{999999729328723} is an apocalyptic number.

999999729328723 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999729328723 is an equidigital number, since it uses as much as digits as its factorization.

999999729328723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134994517056, while the sum is 97.

The spelling of 999999729328723 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, seven hundred twenty-nine million, three hundred twenty-eight thousand, seven hundred twenty-three".