68721217363 has 12 divisors (see below), whose sum is σ = 74488730880. Its totient is φ = 63344722896.

The previous prime is 68721217349. The next prime is 68721217427. The reversal of 68721217363 is 36371212786.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-68721217363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68721217343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2559123 + ... + 2585836.

It is an arithmetic number, because the mean of its divisors is an integer number (6207394240).

Almost surely, 2^68721217363 is an apocalyptic number.

68721217363 is a deficient number, since it is larger than the sum of its proper divisors (5767513517).

68721217363 is a wasteful number, since it uses less digits than its factorization.

68721217363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5145034 (or 5145015 counting only the distinct ones).

The product of its digits is 508032, while the sum is 46.

The spelling of 68721217363 in words is "sixty-eight billion, seven hundred twenty-one million, two hundred seventeen thousand, three hundred sixty-three".