68211808217 has 4 divisors (see below), whose sum is σ = 77956352256. Its totient is φ = 58467264180.

The previous prime is 68211808207. The next prime is 68211808229. The reversal of 68211808217 is 71280811286.

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 68211808217 - 2¹⁰ = 68211807193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68211808207) 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, 4872272009 + ... + 4872272022.

It is an arithmetic number, because the mean of its divisors is an integer number (19489088064).

Almost surely, 2^68211808217 is an apocalyptic number.

It is an amenable number.

68211808217 is a deficient number, since it is larger than the sum of its proper divisors (9744544039).

68211808217 is an equidigital number, since it uses as much as digits as its factorization.

68211808217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9744544038.

The product of its (nonzero) digits is 86016, while the sum is 44.

The spelling of 68211808217 in words is "sixty-eight billion, two hundred eleven million, eight hundred eight thousand, two hundred seventeen".