68018261 has 4 divisors (see below), whose sum is σ = 68950092. Its totient is φ = 67086432.

The previous prime is 68018257. The next prime is 68018263. The reversal of 68018261 is 16281086.

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 12292036 + 55726225 = 3506^2 + 7465^2 .

It is a cyclic number.

It is not a de Polignac number, because 68018261 - 2² = 68018257 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68018263) 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 in 3 ways as a sum of consecutive naturals, for example, 465806 + ... + 465951.

It is an arithmetic number, because the mean of its divisors is an integer number (17237523).

Almost surely, 2^68018261 is an apocalyptic number.

It is an amenable number.

68018261 is a deficient number, since it is larger than the sum of its proper divisors (931831).

68018261 is an equidigital number, since it uses as much as digits as its factorization.

68018261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931830.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 68018261 is about 8247.3184126721. The cubic root of 68018261 is about 408.2020437372.

The spelling of 68018261 in words is "sixty-eight million, eighteen thousand, two hundred sixty-one".