68181508111 has 4 divisors (see below), whose sum is σ = 68182288552. Its totient is φ = 68180727672.

The previous prime is 68181508091. The next prime is 68181508147. The reversal of 68181508111 is 11180518186.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11180518186 = 2 ⋅5590259093.

It is a cyclic number.

It is not a de Polignac number, because 68181508111 - 2⁹ = 68181507599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68181506111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239865 + ... + 440338.

It is an arithmetic number, because the mean of its divisors is an integer number (17045572138).

Almost surely, 2^68181508111 is an apocalyptic number.

68181508111 is a deficient number, since it is larger than the sum of its proper divisors (780441).

68181508111 is a wasteful number, since it uses less digits than its factorization.

68181508111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780440.

The product of its (nonzero) digits is 15360, while the sum is 40.

The spelling of 68181508111 in words is "sixty-eight billion, one hundred eighty-one million, five hundred eight thousand, one hundred eleven".