11111645999 has 4 divisors (see below), whose sum is σ = 11245521336. Its totient is φ = 10977770664.

The previous prime is 11111645981. The next prime is 11111646011. The reversal of 11111645999 is 99954611111.

11111645999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11111645999 - 2¹² = 11111641903 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 (11111645959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66937544 + ... + 66937709.

It is an arithmetic number, because the mean of its divisors is an integer number (2811380334).

Almost surely, 2^11111645999 is an apocalyptic number.

11111645999 is a deficient number, since it is larger than the sum of its proper divisors (133875337).

11111645999 is an equidigital number, since it uses as much as digits as its factorization.

11111645999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133875336.

The product of its digits is 87480, while the sum is 47.

The spelling of 11111645999 in words is "eleven billion, one hundred eleven million, six hundred forty-five thousand, nine hundred ninety-nine".