128130432877 has 2 divisors, whose sum is σ = 128130432878. Its totient is φ = 128130432876.

The previous prime is 128130432853. The next prime is 128130432917. The reversal of 128130432877 is 778234031821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71966646756 + 56163786121 = 268266^2 + 236989^2 .

It is a cyclic number.

It is not a de Polignac number, because 128130432877 - 2¹⁹ = 128129908589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128130432977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64065216438 + 64065216439.

It is an arithmetic number, because the mean of its divisors is an integer number (64065216439).

Almost surely, 2^128130432877 is an apocalyptic number.

It is an amenable number.

128130432877 is a deficient number, since it is larger than the sum of its proper divisors (1).

128130432877 is an equidigital number, since it uses as much as digits as its factorization.

128130432877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 128130432877 in words is "one hundred twenty-eight billion, one hundred thirty million, four hundred thirty-two thousand, eight hundred seventy-seven".