68839255693 has 18 divisors (see below), whose sum is σ = 75614813246. Its totient is φ = 62299578432.

The previous prime is 68839255669. The next prime is 68839255739. The reversal of 68839255693 is 39655293886.

It can be written as a sum of positive squares in 9 ways, for example, as 6737618889 + 62101636804 = 82083^2 + 249202^2 .

It is not a de Polignac number, because 68839255693 - 2⁹ = 68839255181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68839255663) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 50137155 + ... + 50138527.

Almost surely, 2^68839255693 is an apocalyptic number.

It is an amenable number.

68839255693 is a deficient number, since it is larger than the sum of its proper divisors (6775557553).

68839255693 is an frugal number, since it uses more digits than its factorization.

68839255693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865 (or 1439 counting only the distinct ones).

The product of its digits is 83980800, while the sum is 64.

The spelling of 68839255693 in words is "sixty-eight billion, eight hundred thirty-nine million, two hundred fifty-five thousand, six hundred ninety-three".