128793019717 has 2 divisors, whose sum is σ = 128793019718. Its totient is φ = 128793019716.

The previous prime is 128793019679. The next prime is 128793019739. The reversal of 128793019717 is 717910397821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126929025441 + 1863994276 = 356271^2 + 43174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128793019717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128793019787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64396509858 + 64396509859.

It is an arithmetic number, because the mean of its divisors is an integer number (64396509859).

Almost surely, 2^128793019717 is an apocalyptic number.

It is an amenable number.

128793019717 is a deficient number, since it is larger than the sum of its proper divisors (1).

128793019717 is an equidigital number, since it uses as much as digits as its factorization.

128793019717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 55.

The spelling of 128793019717 in words is "one hundred twenty-eight billion, seven hundred ninety-three million, nineteen thousand, seven hundred seventeen".