12640280017 has 2 divisors, whose sum is σ = 12640280018. Its totient is φ = 12640280016.

The previous prime is 12640279999. The next prime is 12640280021. The reversal of 12640280017 is 71008204621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7688483856 + 4951796161 = 87684^2 + 70369^2 .

It is a cyclic number.

It is not a de Polignac number, because 12640280017 - 2⁷ = 12640279889 is a prime.

It is not a weakly prime, because it can be changed into another prime (12640280087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320140008 + 6320140009.

It is an arithmetic number, because the mean of its divisors is an integer number (6320140009).

Almost surely, 2^12640280017 is an apocalyptic number.

It is an amenable number.

12640280017 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640280017 is an equidigital number, since it uses as much as digits as its factorization.

12640280017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

Adding to 12640280017 its reverse (71008204621), we get a palindrome (83648484638).

The spelling of 12640280017 in words is "twelve billion, six hundred forty million, two hundred eighty thousand, seventeen".