12446781457 has 4 divisors (see below), whose sum is σ = 13578307056. Its totient is φ = 11315255860.

The previous prime is 12446781437. The next prime is 12446781461. The reversal of 12446781457 is 75418764421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12446781457 - 2⁷ = 12446781329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12446781457.

It is not an unprimeable number, because it can be changed into a prime (12446781437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565762783 + ... + 565762804.

It is an arithmetic number, because the mean of its divisors is an integer number (3394576764).

Almost surely, 2^12446781457 is an apocalyptic number.

It is an amenable number.

12446781457 is a deficient number, since it is larger than the sum of its proper divisors (1131525599).

12446781457 is a wasteful number, since it uses less digits than its factorization.

12446781457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131525598.

The product of its digits is 1505280, while the sum is 49.

The spelling of 12446781457 in words is "twelve billion, four hundred forty-six million, seven hundred eighty-one thousand, four hundred fifty-seven".