128877682189 has 2 divisors, whose sum is σ = 128877682190. Its totient is φ = 128877682188.

The previous prime is 128877682183. The next prime is 128877682207. The reversal of 128877682189 is 981286778821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101861828964 + 27015853225 = 319158^2 + 164365^2 .

It is an emirp because it is prime and its reverse (981286778821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128877682189 - 2⁹ = 128877681677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128877682183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64438841094 + 64438841095.

It is an arithmetic number, because the mean of its divisors is an integer number (64438841095).

Almost surely, 2^128877682189 is an apocalyptic number.

It is an amenable number.

128877682189 is a deficient number, since it is larger than the sum of its proper divisors (1).

128877682189 is an equidigital number, since it uses as much as digits as its factorization.

128877682189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43352064, while the sum is 67.

It can be divided in two parts, 12887 and 7682189, that added together give a square (7695076 = 2774²).

The spelling of 128877682189 in words is "one hundred twenty-eight billion, eight hundred seventy-seven million, six hundred eighty-two thousand, one hundred eighty-nine".