12446781461 has 2 divisors, whose sum is σ = 12446781462. Its totient is φ = 12446781460.

The previous prime is 12446781437. The next prime is 12446781467. The reversal of 12446781461 is 16418764421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10562700625 + 1884080836 = 102775^2 + 43406^2 .

It is a cyclic number.

It is not a de Polignac number, because 12446781461 - 2³⁰ = 11373039637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12446781467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6223390730 + 6223390731.

It is an arithmetic number, because the mean of its divisors is an integer number (6223390731).

Almost surely, 2^12446781461 is an apocalyptic number.

It is an amenable number.

12446781461 is a deficient number, since it is larger than the sum of its proper divisors (1).

12446781461 is an equidigital number, since it uses as much as digits as its factorization.

12446781461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 44.

The spelling of 12446781461 in words is "twelve billion, four hundred forty-six million, seven hundred eighty-one thousand, four hundred sixty-one".