681668246 has 8 divisors (see below), whose sum is σ = 1168574160. Its totient is φ = 292143528.

The previous prime is 681668237. The next prime is 681668257. The reversal of 681668246 is 642866186.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 681668246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24345281 + ... + 24345308.

It is an arithmetic number, because the mean of its divisors is an integer number (146071770).

Almost surely, 2^681668246 is an apocalyptic number.

681668246 is a deficient number, since it is larger than the sum of its proper divisors (486905914).

681668246 is a wasteful number, since it uses less digits than its factorization.

681668246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48690598.

The product of its digits is 663552, while the sum is 47.

The square root of 681668246 is about 26108.7771831620. Note that the first 3 decimals coincide. The cubic root of 681668246 is about 880.0844641723.

The spelling of 681668246 in words is "six hundred eighty-one million, six hundred sixty-eight thousand, two hundred forty-six".