68011681 has 8 divisors (see below), whose sum is σ = 70576704. Its totient is φ = 65491440.

The previous prime is 68011651. The next prime is 68011693. The reversal of 68011681 is 18611086.

It is a happy number.

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 68011681 - 2⁷ = 68011553 is a prime.

It is a super-2 number, since 2×68011681² = 9251177504891522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68011651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8086 + ... + 14191.

It is an arithmetic number, because the mean of its divisors is an integer number (8822088).

Almost surely, 2^68011681 is an apocalyptic number.

It is an amenable number.

68011681 is a deficient number, since it is larger than the sum of its proper divisors (2565023).

68011681 is a wasteful number, since it uses less digits than its factorization.

68011681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22391.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 68011681 is about 8246.9194854806. The cubic root of 68011681 is about 408.1888803307.

The spelling of 68011681 in words is "sixty-eight million, eleven thousand, six hundred eighty-one".