12205386661 has 8 divisors (see below), whose sum is σ = 13157460344. Its totient is φ = 11255198400.

The previous prime is 12205386653. The next prime is 12205386667. The reversal of 12205386661 is 16668350221.

It can be written as a sum of positive squares in 4 ways, for example, as 971506561 + 11233880100 = 31169^2 + 105990^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12205386661 - 2³ = 12205386653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12205386667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457890 + ... + 483811.

It is an arithmetic number, because the mean of its divisors is an integer number (1644682543).

Almost surely, 2^12205386661 is an apocalyptic number.

It is an amenable number.

12205386661 is a deficient number, since it is larger than the sum of its proper divisors (952073683).

12205386661 is an equidigital number, since it uses as much as digits as its factorization.

12205386661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942711.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 12205386661 in words is "twelve billion, two hundred five million, three hundred eighty-six thousand, six hundred sixty-one".