999995599999 has 16 divisors (see below), whose sum is σ = 1105914461184. Its totient is φ = 896579928000.

The previous prime is 999995599943. The next prime is 999995600017.

It is a happy number.

999995599999 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 999995599999 - 2³⁷ = 862556646527 is a prime.

It is a super-4 number, since 4×999995599999⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999995599199) 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 15 ways as a sum of consecutive naturals, for example, 20197224 + ... + 20246674.

It is an arithmetic number, because the mean of its divisors is an integer number (69119653824).

Almost surely, 2^999995599999 is an apocalyptic number.

999995599999 is a deficient number, since it is larger than the sum of its proper divisors (105918861185).

999995599999 is a wasteful number, since it uses less digits than its factorization.

999995599999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74718.

The product of its digits is 87169610025, while the sum is 100.

The spelling of 999995599999 in words is "nine hundred ninety-nine billion, nine hundred ninety-five million, five hundred ninety-nine thousand, nine hundred ninety-nine".