999873378999 has 12 divisors (see below), whose sum is σ = 1575558051912. Its totient is φ = 605983866000.

The previous prime is 999873378983. The next prime is 999873379051.

999873378999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 999873378999 - 2⁴ = 999873378983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999873378929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5049865452 + ... + 5049865649.

It is an arithmetic number, because the mean of its divisors is an integer number (131296504326).

Almost surely, 2^999873378999 is an apocalyptic number.

999873378999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

999873378999 is a deficient number, since it is larger than the sum of its proper divisors (575684672913).

999873378999 is a wasteful number, since it uses less digits than its factorization.

999873378999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10099731118 (or 10099731115 counting only the distinct ones).

The product of its digits is 14999390784, while the sum is 90.

The spelling of 999873378999 in words is "nine hundred ninety-nine billion, eight hundred seventy-three million, three hundred seventy-eight thousand, nine hundred ninety-nine".