999999999996 has 72 divisors (see below), whose sum is σ = 2427731421696. Its totient is φ = 320038719840.

The previous prime is 999999999989. The next prime is 1000000000039. The reversal of 999999999996 is 699999999999.

It is a super-9 number, since 9×999999999996⁹ (a number of 109 digits) contains 999999999 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999999999894 and 999999999903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5916655 + ... + 6083321.

It is an arithmetic number, because the mean of its divisors is an integer number (33718491968).

Almost surely, 2^999999999996 is an apocalyptic number.

It is an amenable number.

999999999996 is an abundant number, since it is smaller than the sum of its proper divisors (1427731421700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999999999996 is a wasteful number, since it uses less digits than its factorization.

999999999996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166959 (or 166830 counting only the distinct ones).

The product of its digits is 188286357654, while the sum is 105.

The spelling of 999999999996 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-six".