128837778697 has 2 divisors, whose sum is σ = 128837778698. Its totient is φ = 128837778696.

The previous prime is 128837778683. The next prime is 128837778703. The reversal of 128837778697 is 796877738821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90305659081 + 38532119616 = 300509^2 + 196296^2 .

It is a cyclic number.

It is not a de Polignac number, because 128837778697 - 2²⁷ = 128703560969 is a prime.

It is not a weakly prime, because it can be changed into another prime (128837778607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64418889348 + 64418889349.

It is an arithmetic number, because the mean of its divisors is an integer number (64418889349).

Almost surely, 2^128837778697 is an apocalyptic number.

It is an amenable number.

128837778697 is a deficient number, since it is larger than the sum of its proper divisors (1).

128837778697 is an equidigital number, since it uses as much as digits as its factorization.

128837778697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 398297088, while the sum is 73.

The spelling of 128837778697 in words is "one hundred twenty-eight billion, eight hundred thirty-seven million, seven hundred seventy-eight thousand, six hundred ninety-seven".