12640785337 has 2 divisors, whose sum is σ = 12640785338. Its totient is φ = 12640785336.

The previous prime is 12640785247. The next prime is 12640785347. The reversal of 12640785337 is 73358704621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12473315856 + 167469481 = 111684^2 + 12941^2 .

It is an emirp because it is prime and its reverse (73358704621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12640785337 - 2¹⁵ = 12640752569 is a prime.

It is a super-2 number, since 2×12640785337² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12640785347) 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 as a sum of consecutive naturals, namely, 6320392668 + 6320392669.

It is an arithmetic number, because the mean of its divisors is an integer number (6320392669).

Almost surely, 2^12640785337 is an apocalyptic number.

It is an amenable number.

12640785337 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640785337 is an equidigital number, since it uses as much as digits as its factorization.

12640785337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 12640785337 in words is "twelve billion, six hundred forty million, seven hundred eighty-five thousand, three hundred thirty-seven".