68218731816 has 32 divisors (see below), whose sum is σ = 170557012800. Its totient is φ = 22738219520.

The previous prime is 68218731767. The next prime is 68218731853. The reversal of 68218731816 is 61813781286.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376696 + ... + 527576.

It is an arithmetic number, because the mean of its divisors is an integer number (5329906650).

Almost surely, 2^68218731816 is an apocalyptic number.

It is an amenable number.

68218731816 is an abundant number, since it is smaller than the sum of its proper divisors (102338280984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68218731816 is a wasteful number, since it uses less digits than its factorization.

68218731816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169729 (or 169725 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The spelling of 68218731816 in words is "sixty-eight billion, two hundred eighteen million, seven hundred thirty-one thousand, eight hundred sixteen".