68688804217 has 4 divisors (see below), whose sum is σ = 74933240976. Its totient is φ = 62444367460.

The previous prime is 68688804157. The next prime is 68688804251. The reversal of 68688804217 is 71240888686.

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 68688804217 - 2³¹ = 66541320569 is a prime.

It is a super-2 number, since 2×68688804217² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68688804817) 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, 3122218363 + ... + 3122218384.

It is an arithmetic number, because the mean of its divisors is an integer number (18733310244).

Almost surely, 2^68688804217 is an apocalyptic number.

It is an amenable number.

68688804217 is a deficient number, since it is larger than the sum of its proper divisors (6244436759).

68688804217 is a wasteful number, since it uses less digits than its factorization.

68688804217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6244436758.

The product of its (nonzero) digits is 8257536, while the sum is 58.

The spelling of 68688804217 in words is "sixty-eight billion, six hundred eighty-eight million, eight hundred four thousand, two hundred seventeen".