12820751987 has 2 divisors, whose sum is σ = 12820751988. Its totient is φ = 12820751986.

The previous prime is 12820751927. The next prime is 12820752001. The reversal of 12820751987 is 78915702821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12820751987 - 2¹⁶ = 12820686451 is a prime.

It is not a weakly prime, because it can be changed into another prime (12820751927) 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, 6410375993 + 6410375994.

It is an arithmetic number, because the mean of its divisors is an integer number (6410375994).

Almost surely, 2^12820751987 is an apocalyptic number.

12820751987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820751987 is an equidigital number, since it uses as much as digits as its factorization.

12820751987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 12820751987 in words is "twelve billion, eight hundred twenty million, seven hundred fifty-one thousand, nine hundred eighty-seven".