681868185 has 8 divisors (see below), whose sum is σ = 1090989120. Its totient is φ = 363663024.

The previous prime is 681868169. The next prime is 681868217. The reversal of 681868185 is 581868186.

681868185 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 681868185 - 2⁴ = 681868169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22728925 + ... + 22728954.

It is an arithmetic number, because the mean of its divisors is an integer number (136373640).

Almost surely, 2^681868185 is an apocalyptic number.

It is an amenable number.

681868185 is a deficient number, since it is larger than the sum of its proper divisors (409120935).

681868185 is a wasteful number, since it uses less digits than its factorization.

681868185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45457887.

The product of its digits is 737280, while the sum is 51.

The square root of 681868185 is about 26112.6058638352. The cubic root of 681868185 is about 880.1705011400.

Subtracting from 681868185 its reverse (581868186), we obtain a palindrome (99999999).

The spelling of 681868185 in words is "six hundred eighty-one million, eight hundred sixty-eight thousand, one hundred eighty-five".