12851780649839 has 2 divisors, whose sum is σ = 12851780649840. Its totient is φ = 12851780649838.

The previous prime is 12851780649793. The next prime is 12851780649847. The reversal of 12851780649839 is 93894608715821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12851780649839 is a prime.

It is a super-2 number, since 2×12851780649839² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12851780649139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6425890324919 + 6425890324920.

It is an arithmetic number, because the mean of its divisors is an integer number (6425890324920).

It is a 1-persistent number, because it is pandigital, but 2⋅12851780649839 = 25703561299678 is not.

Almost surely, 2^{12851780649839} is an apocalyptic number.

12851780649839 is a deficient number, since it is larger than the sum of its proper divisors (1).

12851780649839 is an equidigital number, since it uses as much as digits as its factorization.

12851780649839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209018880, while the sum is 71.

The spelling of 12851780649839 in words is "twelve trillion, eight hundred fifty-one billion, seven hundred eighty million, six hundred forty-nine thousand, eight hundred thirty-nine".