12784513805639 has 2 divisors, whose sum is σ = 12784513805640. Its totient is φ = 12784513805638.

The previous prime is 12784513805627. The next prime is 12784513805669. The reversal of 12784513805639 is 93650831548721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12784513805639 - 2²⁴ = 12784497028423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12784513805669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392256902819 + 6392256902820.

It is an arithmetic number, because the mean of its divisors is an integer number (6392256902820).

It is a 1-persistent number, because it is pandigital, but 2⋅12784513805639 = 25569027611278 is not.

Almost surely, 2^{12784513805639} is an apocalyptic number.

12784513805639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12784513805639 is an equidigital number, since it uses as much as digits as its factorization.

12784513805639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43545600, while the sum is 62.

The spelling of 12784513805639 in words is "twelve trillion, seven hundred eighty-four billion, five hundred thirteen million, eight hundred five thousand, six hundred thirty-nine".