11661433666 has 4 divisors (see below), whose sum is σ = 17492150502. Its totient is φ = 5830716832.

The previous prime is 11661433661. The next prime is 11661433681. The reversal of 11661433666 is 66633416611.

11661433666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9929126025 + 1732307641 = 99645^2 + 41621^2 .

It is not an unprimeable number, because it can be changed into a prime (11661433661) 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 as a sum of consecutive naturals, namely, 2915358415 + ... + 2915358418.

Almost surely, 2^11661433666 is an apocalyptic number.

11661433666 is a deficient number, since it is larger than the sum of its proper divisors (5830716836).

11661433666 is an equidigital number, since it uses as much as digits as its factorization.

11661433666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830716835.

The product of its digits is 279936, while the sum is 43.

The spelling of 11661433666 in words is "eleven billion, six hundred sixty-one million, four hundred thirty-three thousand, six hundred sixty-six".