68855081 has 4 divisors (see below), whose sum is σ = 69464532. Its totient is φ = 68245632.

The previous prime is 68855071. The next prime is 68855099. The reversal of 68855081 is 18055886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18055886 = 2 ⋅9027943.

It can be written as a sum of positive squares in 2 ways, for example, as 2920681 + 65934400 = 1709^2 + 8120^2 .

It is a cyclic number.

It is not a de Polignac number, because 68855081 - 2¹⁰ = 68854057 is a prime.

It is a super-2 number, since 2×68855081² = 9482044359033122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68855011) 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 3 ways as a sum of consecutive naturals, for example, 304556 + ... + 304781.

It is an arithmetic number, because the mean of its divisors is an integer number (17366133).

Almost surely, 2^68855081 is an apocalyptic number.

It is an amenable number.

68855081 is a deficient number, since it is larger than the sum of its proper divisors (609451).

68855081 is a wasteful number, since it uses less digits than its factorization.

68855081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609450.

The product of its (nonzero) digits is 76800, while the sum is 41.

The square root of 68855081 is about 8297.8961791529. The cubic root of 68855081 is about 409.8692444436.

The spelling of 68855081 in words is "sixty-eight million, eight hundred fifty-five thousand, eighty-one".