68181716 has 6 divisors (see below), whose sum is σ = 119318010. Its totient is φ = 34090856.

The previous prime is 68181677. The next prime is 68181719. The reversal of 68181716 is 61718186.

It can be written as a sum of positive squares in only one way, i.e., 46185616 + 21996100 = 6796^2 + 4690^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68181716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68181719) 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 as a sum of consecutive naturals, namely, 8522711 + ... + 8522718.

It is an arithmetic number, because the mean of its divisors is an integer number (19886335).

Almost surely, 2^68181716 is an apocalyptic number.

It is an amenable number.

68181716 is a deficient number, since it is larger than the sum of its proper divisors (51136294).

68181716 is a wasteful number, since it uses less digits than its factorization.

68181716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17045433 (or 17045431 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 68181716 is about 8257.2220510290. Note that the first 3 decimals coincide. The cubic root of 68181716 is about 408.5287662386.

The spelling of 68181716 in words is "sixty-eight million, one hundred eighty-one thousand, seven hundred sixteen".