68776891265 has 4 divisors (see below), whose sum is σ = 82532269524. Its totient is φ = 55021513008.

The previous prime is 68776891259. The next prime is 68776891321. The reversal of 68776891265 is 56219867786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56219867786 = 2 ⋅28109933893.

It can be written as a sum of positive squares in 2 ways, for example, as 54445688896 + 14331202369 = 233336^2 + 119713^2 .

It is a cyclic number.

It is not a de Polignac number, because 68776891265 - 2¹⁰ = 68776890241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6877689122 + ... + 6877689131.

It is an arithmetic number, because the mean of its divisors is an integer number (20633067381).

Almost surely, 2^68776891265 is an apocalyptic number.

It is an amenable number.

68776891265 is a deficient number, since it is larger than the sum of its proper divisors (13755378259).

68776891265 is a wasteful number, since it uses less digits than its factorization.

68776891265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13755378258.

The product of its digits is 60963840, while the sum is 65.

The spelling of 68776891265 in words is "sixty-eight billion, seven hundred seventy-six million, eight hundred ninety-one thousand, two hundred sixty-five".