11091719985 has 16 divisors (see below), whose sum is σ = 18518350464. Its totient is φ = 5658384512.

The previous prime is 11091719981. The next prime is 11091719993. The reversal of 11091719985 is 58991719011.

11091719985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11091719985 - 2² = 11091719981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11091719981) 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 15 ways as a sum of consecutive naturals, for example, 16074612 + ... + 16075301.

It is an arithmetic number, because the mean of its divisors is an integer number (1157396904).

Almost surely, 2^11091719985 is an apocalyptic number.

11091719985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11091719985 is a deficient number, since it is larger than the sum of its proper divisors (7426630479).

11091719985 is a wasteful number, since it uses less digits than its factorization.

11091719985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32149944.

The product of its (nonzero) digits is 204120, while the sum is 51.

The spelling of 11091719985 in words is "eleven billion, ninety-one million, seven hundred nineteen thousand, nine hundred eighty-five".