12640044173 has 2 divisors, whose sum is σ = 12640044174. Its totient is φ = 12640044172.

The previous prime is 12640044167. The next prime is 12640044199. The reversal of 12640044173 is 37144004621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12588391204 + 51652969 = 112198^2 + 7187^2 .

It is an emirp because it is prime and its reverse (37144004621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12640044173 - 2²⁰ = 12638995597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12640044163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320022086 + 6320022087.

It is an arithmetic number, because the mean of its divisors is an integer number (6320022087).

Almost surely, 2^12640044173 is an apocalyptic number.

It is an amenable number.

12640044173 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640044173 is an equidigital number, since it uses as much as digits as its factorization.

12640044173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

Adding to 12640044173 its reverse (37144004621), we get a palindrome (49784048794).

The spelling of 12640044173 in words is "twelve billion, six hundred forty million, forty-four thousand, one hundred seventy-three".