68176601681 has 2 divisors, whose sum is σ = 68176601682. Its totient is φ = 68176601680.

The previous prime is 68176601659. The next prime is 68176601791. The reversal of 68176601681 is 18610667186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45706591681 + 22470010000 = 213791^2 + 149900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68176601681 is a prime.

It is a super-2 number, since 2×68176601681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68176601281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34088300840 + 34088300841.

It is an arithmetic number, because the mean of its divisors is an integer number (34088300841).

Almost surely, 2^68176601681 is an apocalyptic number.

It is an amenable number.

68176601681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68176601681 is an equidigital number, since it uses as much as digits as its factorization.

68176601681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 68176601681 in words is "sixty-eight billion, one hundred seventy-six million, six hundred one thousand, six hundred eighty-one".