68360808681 has 135 divisors (see below), whose sum is σ = 119323817613. Its totient is φ = 38967849360.

The previous prime is 68360808667. The next prime is 68360808709. The reversal of 68360808681 is 18680806386.

The square root of 68360808681 is 261459.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 68360808681 - 2¹³ = 68360800489 is a prime.

It is a super-2 number, since 2×68360808681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68360808601) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 491804310 + ... + 491804448.

Almost surely, 2^68360808681 is an apocalyptic number.

68360808681 is the 261459-th square number.

68360808681 is the 130730-th centered octagonal number.

It is an amenable number.

68360808681 is a deficient number, since it is larger than the sum of its proper divisors (50963008932).

68360808681 is a wasteful number, since it uses less digits than its factorization.

68360808681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 68360808681 in words is "sixty-eight billion, three hundred sixty million, eight hundred eight thousand, six hundred eighty-one".