68668560773 has 4 divisors (see below), whose sum is σ = 68674007340. Its totient is φ = 68663114208.

The previous prime is 68668560767. The next prime is 68668560787. The reversal of 68668560773 is 37706586686.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38470115044 + 30198445729 = 196138^2 + 173777^2 .

It is a cyclic number.

It is not a de Polignac number, because 68668560773 - 2¹⁶ = 68668495237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68668560743) 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 in 3 ways as a sum of consecutive naturals, for example, 2704328 + ... + 2729601.

It is an arithmetic number, because the mean of its divisors is an integer number (17168501835).

Almost surely, 2^68668560773 is an apocalyptic number.

It is an amenable number.

68668560773 is a deficient number, since it is larger than the sum of its proper divisors (5446567).

68668560773 is a wasteful number, since it uses less digits than its factorization.

68668560773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5446566.

The product of its (nonzero) digits is 60963840, while the sum is 62.

The spelling of 68668560773 in words is "sixty-eight billion, six hundred sixty-eight million, five hundred sixty thousand, seven hundred seventy-three".