128918347993 has 2 divisors, whose sum is σ = 128918347994. Its totient is φ = 128918347992.

The previous prime is 128918347981. The next prime is 128918348071. The reversal of 128918347993 is 399743819821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126328352329 + 2589995664 = 355427^2 + 50892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128918347993 is a prime.

It is not a weakly prime, because it can be changed into another prime (128918347963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64459173996 + 64459173997.

It is an arithmetic number, because the mean of its divisors is an integer number (64459173997).

Almost surely, 2^128918347993 is an apocalyptic number.

It is an amenable number.

128918347993 is a deficient number, since it is larger than the sum of its proper divisors (1).

128918347993 is an equidigital number, since it uses as much as digits as its factorization.

128918347993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 64.

The spelling of 128918347993 in words is "one hundred twenty-eight billion, nine hundred eighteen million, three hundred forty-seven thousand, nine hundred ninety-three".