68665709 has 12 divisors (see below), whose sum is σ = 80186688. Its totient is φ = 58627800.

The previous prime is 68665699. The next prime is 68665717. The reversal of 68665709 is 90756686.

It is not a de Polignac number, because 68665709 - 2¹² = 68661613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68665739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10694 + ... + 15864.

It is an arithmetic number, because the mean of its divisors is an integer number (6682224).

Almost surely, 2^68665709 is an apocalyptic number.

It is an amenable number.

68665709 is a deficient number, since it is larger than the sum of its proper divisors (11520979).

68665709 is a wasteful number, since it uses less digits than its factorization.

68665709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5456 (or 5449 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 68665709 is about 8286.4774783982. The cubic root of 68665709 is about 409.4931452331.

The spelling of 68665709 in words is "sixty-eight million, six hundred sixty-five thousand, seven hundred nine".