128505611279 has 2 divisors, whose sum is σ = 128505611280. Its totient is φ = 128505611278.

The previous prime is 128505611261. The next prime is 128505611309. The reversal of 128505611279 is 972116505821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128505611279 - 2¹² = 128505607183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128505611779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64252805639 + 64252805640.

It is an arithmetic number, because the mean of its divisors is an integer number (64252805640).

Almost surely, 2^128505611279 is an apocalyptic number.

128505611279 is a deficient number, since it is larger than the sum of its proper divisors (1).

128505611279 is an equidigital number, since it uses as much as digits as its factorization.

128505611279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 128505611279 in words is "one hundred twenty-eight billion, five hundred five million, six hundred eleven thousand, two hundred seventy-nine".