12640547041 has 4 divisors (see below), whose sum is σ = 12640801300. Its totient is φ = 12640292784.

The previous prime is 12640547009. The next prime is 12640547071. The reversal of 12640547041 is 14074504621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6005630016 + 6634917025 = 77496^2 + 81455^2 .

It is a cyclic number.

It is not a de Polignac number, because 12640547041 - 2⁵ = 12640547009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12640546988 and 12640547006.

It is not an unprimeable number, because it can be changed into a prime (12640547071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25446 + ... + 161023.

It is an arithmetic number, because the mean of its divisors is an integer number (3160200325).

Almost surely, 2^12640547041 is an apocalyptic number.

It is an amenable number.

12640547041 is a deficient number, since it is larger than the sum of its proper divisors (254259).

12640547041 is an equidigital number, since it uses as much as digits as its factorization.

12640547041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254258.

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 12640547041 in words is "twelve billion, six hundred forty million, five hundred forty-seven thousand, forty-one".