12640448533 has 2 divisors, whose sum is σ = 12640448534. Its totient is φ = 12640448532.

The previous prime is 12640448521. The next prime is 12640448593. The reversal of 12640448533 is 33584404621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11576253649 + 1064194884 = 107593^2 + 32622^2 .

It is a cyclic number.

It is not a de Polignac number, because 12640448533 - 2²¹ = 12638351381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12640448593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320224266 + 6320224267.

It is an arithmetic number, because the mean of its divisors is an integer number (6320224267).

Almost surely, 2^12640448533 is an apocalyptic number.

It is an amenable number.

12640448533 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640448533 is an equidigital number, since it uses as much as digits as its factorization.

12640448533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 12640448533 in words is "twelve billion, six hundred forty million, four hundred forty-eight thousand, five hundred thirty-three".