11805561669 has 16 divisors (see below), whose sum is σ = 18075502080. Its totient is φ = 6778312560.

The previous prime is 11805561667. The next prime is 11805561683. The reversal of 11805561669 is 96616550811.

It is not a de Polignac number, because 11805561669 - 2¹ = 11805561667 is a prime.

It is a super-2 number, since 2×11805561669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11805561667) 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, 9413697 + ... + 9414950.

It is an arithmetic number, because the mean of its divisors is an integer number (1129718880).

Almost surely, 2^11805561669 is an apocalyptic number.

11805561669 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11805561669 is a deficient number, since it is larger than the sum of its proper divisors (6269940411).

11805561669 is a wasteful number, since it uses less digits than its factorization.

11805561669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18828680.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 11805561669 in words is "eleven billion, eight hundred five million, five hundred sixty-one thousand, six hundred sixty-nine".