68685766721 has 8 divisors (see below), whose sum is σ = 80693768064. Its totient is φ = 57638405520.

The previous prime is 68685766717. The next prime is 68685766727. The reversal of 68685766721 is 12766758686.

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 68685766721 - 2² = 68685766717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68685766727) 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, 240159881 + ... + 240160166.

It is an arithmetic number, because the mean of its divisors is an integer number (10086721008).

Almost surely, 2^68685766721 is an apocalyptic number.

It is an amenable number.

68685766721 is a deficient number, since it is larger than the sum of its proper divisors (12008001343).

68685766721 is a wasteful number, since it uses less digits than its factorization.

68685766721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480320071.

The product of its digits is 40642560, while the sum is 62.

The spelling of 68685766721 in words is "sixty-eight billion, six hundred eighty-five million, seven hundred sixty-six thousand, seven hundred twenty-one".