128859970861 has 2 divisors, whose sum is σ = 128859970862. Its totient is φ = 128859970860.

The previous prime is 128859970847. The next prime is 128859970891. The reversal of 128859970861 is 168079958821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127927828900 + 932141961 = 357670^2 + 30531^2 .

It is a cyclic number.

It is not a de Polignac number, because 128859970861 - 2¹³ = 128859962669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128859970793 and 128859970802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128859970891) 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, 64429985430 + 64429985431.

It is an arithmetic number, because the mean of its divisors is an integer number (64429985431).

Almost surely, 2^128859970861 is an apocalyptic number.

It is an amenable number.

128859970861 is a deficient number, since it is larger than the sum of its proper divisors (1).

128859970861 is an equidigital number, since it uses as much as digits as its factorization.

128859970861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 64.

It can be divided in two parts, 12885 and 9970861, that added together give a triangular number (9983746 = T₄₄₆₈).

The spelling of 128859970861 in words is "one hundred twenty-eight billion, eight hundred fifty-nine million, nine hundred seventy thousand, eight hundred sixty-one".