12823761661 has 16 divisors (see below), whose sum is σ = 13818147328. Its totient is φ = 11876673600.

The previous prime is 12823761641. The next prime is 12823761667. The reversal of 12823761661 is 16616732821.

It is a cyclic number.

It is not a de Polignac number, because 12823761661 - 2⁹ = 12823761149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12823761667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21675 + ... + 161608.

It is an arithmetic number, because the mean of its divisors is an integer number (863634208).

Almost surely, 2^12823761661 is an apocalyptic number.

It is an amenable number.

12823761661 is a deficient number, since it is larger than the sum of its proper divisors (994385667).

12823761661 is a wasteful number, since it uses less digits than its factorization.

12823761661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183412.

The product of its digits is 145152, while the sum is 43.

The spelling of 12823761661 in words is "twelve billion, eight hundred twenty-three million, seven hundred sixty-one thousand, six hundred sixty-one".