68517287218 has 4 divisors (see below), whose sum is σ = 102775930830. Its totient is φ = 34258643608.

The previous prime is 68517287197. The next prime is 68517287231. The reversal of 68517287218 is 81278271586.

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

It can be written as a sum of positive squares in only one way, i.e., 61542197929 + 6975089289 = 248077^2 + 83517^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17129321803 + ... + 17129321806.

Almost surely, 2^68517287218 is an apocalyptic number.

68517287218 is a deficient number, since it is larger than the sum of its proper divisors (34258643612).

68517287218 is a wasteful number, since it uses less digits than its factorization.

68517287218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34258643611.

The product of its digits is 3010560, while the sum is 55.

The spelling of 68517287218 in words is "sixty-eight billion, five hundred seventeen million, two hundred eighty-seven thousand, two hundred eighteen".