128107775437 has 2 divisors, whose sum is σ = 128107775438. Its totient is φ = 128107775436.

The previous prime is 128107775399. The next prime is 128107775441. The reversal of 128107775437 is 734577701821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88991242596 + 39116532841 = 298314^2 + 197779^2 .

It is an emirp because it is prime and its reverse (734577701821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128107775437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128107775837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64053887718 + 64053887719.

It is an arithmetic number, because the mean of its divisors is an integer number (64053887719).

Almost surely, 2^128107775437 is an apocalyptic number.

It is an amenable number.

128107775437 is a deficient number, since it is larger than the sum of its proper divisors (1).

128107775437 is an equidigital number, since it uses as much as digits as its factorization.

128107775437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304960, while the sum is 52.

The spelling of 128107775437 in words is "one hundred twenty-eight billion, one hundred seven million, seven hundred seventy-five thousand, four hundred thirty-seven".