1011111109999 has 4 divisors (see below), whose sum is σ = 1026202320664. Its totient is φ = 996019899336.

The previous prime is 1011111109997. The next prime is 1011111110011. The reversal of 1011111109999 is 9999011111101.

It is a happy number.

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 1011111109999 - 2¹ = 1011111109997 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 (1011111109997) 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, 7545605232 + ... + 7545605365.

It is an arithmetic number, because the mean of its divisors is an integer number (256550580166).

Almost surely, 2^{1011111109999} is an apocalyptic number.

1011111109999 is a deficient number, since it is larger than the sum of its proper divisors (15091210665).

1011111109999 is an equidigital number, since it uses as much as digits as its factorization.

1011111109999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15091210664.

The product of its (nonzero) digits is 6561, while the sum is 43.

The spelling of 1011111109999 in words is "one trillion, eleven billion, one hundred eleven million, one hundred nine thousand, nine hundred ninety-nine".