10000000009999 has 4 divisors (see below), whose sum is σ = 10000156160664. Its totient is φ = 9999843859336.

The previous prime is 10000000009969. The next prime is 10000000010047. The reversal of 10000000009999 is 99990000000001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10000000009999 - 2⁷ = 10000000009871 is a prime.

It is a Duffinian number.

10000000009999 is a modest number, since divided by 9999 gives 10 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000000009949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77979232 + ... + 78107365.

It is an arithmetic number, because the mean of its divisors is an integer number (2500039040166).

Almost surely, 2^{10000000009999} is an apocalyptic number.

10000000009999 is a deficient number, since it is larger than the sum of its proper divisors (156150665).

10000000009999 is an equidigital number, since it uses as much as digits as its factorization.

10000000009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156150664.

The product of its (nonzero) digits is 6561, while the sum is 37.

The spelling of 10000000009999 in words is "ten trillion, nine thousand, nine hundred ninety-nine".