68456739217 has 8 divisors (see below), whose sum is σ = 71633469096. Its totient is φ = 65349827712.

The previous prime is 68456739203. The next prime is 68456739229. The reversal of 68456739217 is 71293765486.

It can be written as a sum of positive squares in 4 ways, for example, as 36309683601 + 32147055616 = 190551^2 + 179296^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68456739217 - 2¹⁹ = 68456214929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68456739257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17452588 + ... + 17456509.

It is an arithmetic number, because the mean of its divisors is an integer number (8954183637).

Almost surely, 2^68456739217 is an apocalyptic number.

It is an amenable number.

68456739217 is a deficient number, since it is larger than the sum of its proper divisors (3176729879).

68456739217 is a wasteful number, since it uses less digits than its factorization.

68456739217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34909187.

The product of its digits is 15240960, while the sum is 58.

The spelling of 68456739217 in words is "sixty-eight billion, four hundred fifty-six million, seven hundred thirty-nine thousand, two hundred seventeen".