68651676721 has 2 divisors, whose sum is σ = 68651676722. Its totient is φ = 68651676720.

The previous prime is 68651676701. The next prime is 68651676787. The reversal of 68651676721 is 12767615686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57546732321 + 11104944400 = 239889^2 + 105380^2 .

It is a cyclic number.

It is not a de Polignac number, because 68651676721 - 2⁹ = 68651676209 is a prime.

It is not a weakly prime, because it can be changed into another prime (68651676701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34325838360 + 34325838361.

It is an arithmetic number, because the mean of its divisors is an integer number (34325838361).

Almost surely, 2^68651676721 is an apocalyptic number.

It is an amenable number.

68651676721 is a deficient number, since it is larger than the sum of its proper divisors (1).

68651676721 is an equidigital number, since it uses as much as digits as its factorization.

68651676721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 55.

The spelling of 68651676721 in words is "sixty-eight billion, six hundred fifty-one million, six hundred seventy-six thousand, seven hundred twenty-one".