999984999959 has 8 divisors (see below), whose sum is σ = 1090905674880. Its totient is φ = 909066483000.

The previous prime is 999984999941. The next prime is 999984999971. The reversal of 999984999959 is 959999489999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999984999959 - 2⁸ = 999984999703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999984999919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519884 + ... + 1506734.

It is an arithmetic number, because the mean of its divisors is an integer number (136363209360).

Almost surely, 2^999984999959 is an apocalyptic number.

999984999959 is a deficient number, since it is larger than the sum of its proper divisors (90920674921).

999984999959 is a wasteful number, since it uses less digits than its factorization.

999984999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078981.

The product of its digits is 61987278240, while the sum is 98.

The spelling of 999984999959 in words is "nine hundred ninety-nine billion, nine hundred eighty-four million, nine hundred ninety-nine thousand, nine hundred fifty-nine".