68722008367721 has 4 divisors (see below), whose sum is σ = 68736116770944. Its totient is φ = 68707899964500.

The previous prime is 68722008367711. The next prime is 68722008367729. The reversal of 68722008367721 is 12776380022786.

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 a de Polignac number, because none of the positive numbers 2^k-68722008367721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68722008367729) 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, 7054194305 + ... + 7054204046.

It is an arithmetic number, because the mean of its divisors is an integer number (17184029192736).

Almost surely, 2^{68722008367721} is an apocalyptic number.

It is an amenable number.

68722008367721 is a deficient number, since it is larger than the sum of its proper divisors (14108403223).

68722008367721 is a wasteful number, since it uses less digits than its factorization.

68722008367721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14108403222.

The product of its (nonzero) digits is 18966528, while the sum is 59.

The spelling of 68722008367721 in words is "sixty-eight trillion, seven hundred twenty-two billion, eight million, three hundred sixty-seven thousand, seven hundred twenty-one".