68018155 has 4 divisors (see below), whose sum is σ = 81621792. Its totient is φ = 54414520.

The previous prime is 68018149. The next prime is 68018177. The reversal of 68018155 is 55181086.

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

It is a de Polignac number, because none of the positive numbers 2^k-68018155 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68018155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6801811 + ... + 6801820.

It is an arithmetic number, because the mean of its divisors is an integer number (20405448).

Almost surely, 2^68018155 is an apocalyptic number.

68018155 is a deficient number, since it is larger than the sum of its proper divisors (13603637).

68018155 is a wasteful number, since it uses less digits than its factorization.

68018155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13603636.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 68018155 is about 8247.3119863383. The cubic root of 68018155 is about 408.2018316891.

The spelling of 68018155 in words is "sixty-eight million, eighteen thousand, one hundred fifty-five".