68263242217 has 4 divisors (see below), whose sum is σ = 68761514196. Its totient is φ = 67764970240.

The previous prime is 68263242209. The next prime is 68263242221. The reversal of 68263242217 is 71224236286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35940955561 + 32322286656 = 189581^2 + 179784^2 .

It is a cyclic number.

It is not a de Polignac number, because 68263242217 - 2³ = 68263242209 is a prime.

It is a super-2 number, since 2×68263242217² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68263242247) 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, 249135784 + ... + 249136057.

It is an arithmetic number, because the mean of its divisors is an integer number (17190378549).

Almost surely, 2^68263242217 is an apocalyptic number.

It is an amenable number.

68263242217 is a deficient number, since it is larger than the sum of its proper divisors (498271979).

68263242217 is a wasteful number, since it uses less digits than its factorization.

68263242217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498271978.

The product of its digits is 387072, while the sum is 43.

The spelling of 68263242217 in words is "sixty-eight billion, two hundred sixty-three million, two hundred forty-two thousand, two hundred seventeen".