68396665 has 4 divisors (see below), whose sum is σ = 82076004. Its totient is φ = 54717328.

The previous prime is 68396663. The next prime is 68396707. The reversal of 68396665 is 56669386.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32684089 + 35712576 = 5717^2 + 5976^2 .

It is a cyclic number.

It is not a de Polignac number, because 68396665 - 2¹ = 68396663 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (68396663) 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 3 ways as a sum of consecutive naturals, for example, 6839662 + ... + 6839671.

It is an arithmetic number, because the mean of its divisors is an integer number (20519001).

Almost surely, 2^68396665 is an apocalyptic number.

It is an amenable number.

68396665 is a deficient number, since it is larger than the sum of its proper divisors (13679339).

68396665 is a wasteful number, since it uses less digits than its factorization.

68396665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13679338.

The product of its digits is 1399680, while the sum is 49.

The square root of 68396665 is about 8270.2276268553. The cubic root of 68396665 is about 408.9576237921.

The spelling of 68396665 in words is "sixty-eight million, three hundred ninety-six thousand, six hundred sixty-five".