999999999999923 has 16 divisors (see below), whose sum is σ = 1118294318877120. Its totient is φ = 887857913599104.

The previous prime is 999999999999883. The next prime is 999999999999947. The reversal of 999999999999923 is 329999999999999.

It is a cyclic number.

It is not a de Polignac number, because 999999999999923 - 2¹⁴ = 999999999983539 is a prime.

It is a super-9 number, since 9×999999999999923⁹ (a number of 136 digits) contains 999999999 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999999999999923.

It is not an unprimeable number, because it can be changed into a prime (999999999929923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5042714336 + ... + 5042912637.

It is an arithmetic number, because the mean of its divisors is an integer number (69893394929820).

Almost surely, 2^{999999999999923} is an apocalyptic number.

999999999999923 is a deficient number, since it is larger than the sum of its proper divisors (118294318877197).

999999999999923 is a wasteful number, since it uses less digits than its factorization.

999999999999923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10085627278.

The product of its digits is 15251194969974, while the sum is 122.

The spelling of 999999999999923 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-three".