999944555661111 has 32 divisors (see below), whose sum is σ = 1407177874022400. Its totient is φ = 629857920555360.

The previous prime is 999944555661091. The next prime is 999944555661221. The reversal of 999944555661111 is 111166555449999.

999944555661111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999944555661111 - 2²² = 999944551466807 is a prime.

It is a super-2 number, since 2×999944555661111² (a number of 31 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (75) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (999944555668111) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 707245690 + ... + 708658136.

It is an arithmetic number, because the mean of its divisors is an integer number (43974308563200).

Almost surely, 2^{999944555661111} is an apocalyptic number.

999944555661111 is a deficient number, since it is larger than the sum of its proper divisors (407233318361289).

999944555661111 is a wasteful number, since it uses less digits than its factorization.

999944555661111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445619.

The product of its digits is 472392000, while the sum is 75.

The spelling of 999944555661111 in words is "nine hundred ninety-nine trillion, nine hundred forty-four billion, five hundred fifty-five million, six hundred sixty-one thousand, one hundred eleven".