68218916729 has 4 divisors (see below), whose sum is σ = 69237109584. Its totient is φ = 67200723876.

The previous prime is 68218916699. The next prime is 68218916747. The reversal of 68218916729 is 92761981286.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68218916729 - 2¹² = 68218912633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68218916929) 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, 509096327 + ... + 509096460.

It is an arithmetic number, because the mean of its divisors is an integer number (17309277396).

Almost surely, 2^68218916729 is an apocalyptic number.

It is an amenable number.

68218916729 is a deficient number, since it is larger than the sum of its proper divisors (1018192855).

68218916729 is a wasteful number, since it uses less digits than its factorization.

68218916729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018192854.

The product of its digits is 5225472, while the sum is 59.

The spelling of 68218916729 in words is "sixty-eight billion, two hundred eighteen million, nine hundred sixteen thousand, seven hundred twenty-nine".