11809850985 has 48 divisors (see below), whose sum is σ = 21170073600. Its totient is φ = 6084063360.

The previous prime is 11809850951. The next prime is 11809850993. The reversal of 11809850985 is 58905890811.

It is not a de Polignac number, because 11809850985 - 2¹¹ = 11809848937 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 769416 + ... + 784614.

It is an arithmetic number, because the mean of its divisors is an integer number (441043200).

Almost surely, 2^11809850985 is an apocalyptic number.

11809850985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11809850985 is a deficient number, since it is larger than the sum of its proper divisors (9360222615).

11809850985 is a wasteful number, since it uses less digits than its factorization.

11809850985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15798 (or 15795 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 54.

The spelling of 11809850985 in words is "eleven billion, eight hundred nine million, eight hundred fifty thousand, nine hundred eighty-five".