128281682677787 has 2 divisors, whose sum is σ = 128281682677788. Its totient is φ = 128281682677786.

The previous prime is 128281682677781. The next prime is 128281682677861. The reversal of 128281682677787 is 787776286182821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128281682677787 - 2¹⁸ = 128281682415643 is a prime.

It is a super-3 number, since 3×128281682677787³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (128281682677781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64140841338893 + 64140841338894.

It is an arithmetic number, because the mean of its divisors is an integer number (64140841338894).

Almost surely, 2^{128281682677787} is an apocalyptic number.

128281682677787 is a deficient number, since it is larger than the sum of its proper divisors (1).

128281682677787 is an equidigital number, since it uses as much as digits as its factorization.

128281682677787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2832334848, while the sum is 80.

The spelling of 128281682677787 in words is "one hundred twenty-eight trillion, two hundred eighty-one billion, six hundred eighty-two million, six hundred seventy-seven thousand, seven hundred eighty-seven".