68018637215 has 4 divisors (see below), whose sum is σ = 81622364664. Its totient is φ = 54414909768.

The previous prime is 68018637179. The next prime is 68018637217. The reversal of 68018637215 is 51273681086.

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

It is a cyclic number.

It is not a de Polignac number, because 68018637215 - 2¹² = 68018633119 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 68018637215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68018637217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6801863717 + ... + 6801863726.

It is an arithmetic number, because the mean of its divisors is an integer number (20405591166).

Almost surely, 2^68018637215 is an apocalyptic number.

68018637215 is a deficient number, since it is larger than the sum of its proper divisors (13603727449).

68018637215 is a wasteful number, since it uses less digits than its factorization.

68018637215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13603727448.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 68018637215 in words is "sixty-eight billion, eighteen million, six hundred thirty-seven thousand, two hundred fifteen".