68161817 has 4 divisors (see below), whose sum is σ = 68192436. Its totient is φ = 68131200.

The previous prime is 68161801. The next prime is 68161843. The reversal of 68161817 is 71816186.

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 58308496 + 9853321 = 7636^2 + 3139^2 .

It is a cyclic number.

It is not a de Polignac number, because 68161817 - 2⁴ = 68161801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68161897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11684 + ... + 16517.

It is an arithmetic number, because the mean of its divisors is an integer number (17048109).

Almost surely, 2^68161817 is an apocalyptic number.

It is an amenable number.

68161817 is a deficient number, since it is larger than the sum of its proper divisors (30619).

68161817 is a wasteful number, since it uses less digits than its factorization.

68161817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30618.

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

The square root of 68161817 is about 8256.0170179088. The cubic root of 68161817 is about 408.4890189995.

The spelling of 68161817 in words is "sixty-eight million, one hundred sixty-one thousand, eight hundred seventeen".