2128769278693 has 2 divisors, whose sum is σ = 2128769278694. Its totient is φ = 2128769278692.

The previous prime is 2128769278637. The next prime is 2128769278703. The reversal of 2128769278693 is 3968729678212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1244458495809 + 884310782884 = 1115553^2 + 940378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128769278693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2128769278193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064384639346 + 1064384639347.

It is an arithmetic number, because the mean of its divisors is an integer number (1064384639347).

Almost surely, 2^{2128769278693} is an apocalyptic number.

It is an amenable number.

2128769278693 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128769278693 is an equidigital number, since it uses as much as digits as its factorization.

2128769278693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219469824, while the sum is 70.

The spelling of 2128769278693 in words is "two trillion, one hundred twenty-eight billion, seven hundred sixty-nine million, two hundred seventy-eight thousand, six hundred ninety-three".