11566665650 has 24 divisors (see below), whose sum is σ = 21577869300. Its totient is φ = 4612930560.

The previous prime is 11566665629. The next prime is 11566665659. The reversal of 11566665650 is 5656666511.

It can be written as a sum of positive squares in 6 ways, for example, as 3933672961 + 7632992689 = 62719^2 + 87367^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11566665595 and 11566665604.

It is not an unprimeable number, because it can be changed into a prime (11566665659) 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 11 ways as a sum of consecutive naturals, for example, 326375 + ... + 360074.

Almost surely, 2^11566665650 is an apocalyptic number.

11566665650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11566665650 is a deficient number, since it is larger than the sum of its proper divisors (10011203650).

11566665650 is a wasteful number, since it uses less digits than its factorization.

11566665650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686798 (or 686793 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 11566665650 in words is "eleven billion, five hundred sixty-six million, six hundred sixty-five thousand, six hundred fifty".