11809774081 has 16 divisors (see below), whose sum is σ = 14783610240. Its totient is φ = 9198685440.

The previous prime is 11809774073. The next prime is 11809774091. The reversal of 11809774081 is 18047790811.

It is a happy number.

It is not a de Polignac number, because 11809774081 - 2³ = 11809774073 is a prime.

It is a super-2 number, since 2×11809774081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11809774021) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1707615 + ... + 1714516.

It is an arithmetic number, because the mean of its divisors is an integer number (923975640).

Almost surely, 2^11809774081 is an apocalyptic number.

It is an amenable number.

11809774081 is a deficient number, since it is larger than the sum of its proper divisors (2973836159).

11809774081 is a wasteful number, since it uses less digits than its factorization.

11809774081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422184.

The product of its (nonzero) digits is 112896, while the sum is 46.

The spelling of 11809774081 in words is "eleven billion, eight hundred nine million, seven hundred seventy-four thousand, eighty-one".