68181818181 has 8 divisors (see below), whose sum is σ = 90910318464. Its totient is φ = 45453931680.

The previous prime is 68181818167. The next prime is 68181818189. The reversal of 68181818181 is 18181818186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68181818181 - 2⁷ = 68181818053 is a prime.

It is a super-2 number, since 2×68181818181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68181818189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283521 + ... + 465561.

It is an arithmetic number, because the mean of its divisors is an integer number (11363789808).

Almost surely, 2^68181818181 is an apocalyptic number.

It is an amenable number.

68181818181 is a deficient number, since it is larger than the sum of its proper divisors (22728500283).

68181818181 is a wasteful number, since it uses less digits than its factorization.

68181818181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306891.

The product of its digits is 196608, while the sum is 51.

The spelling of 68181818181 in words is "sixty-eight billion, one hundred eighty-one million, eight hundred eighteen thousand, one hundred eighty-one".