68581477617 has 4 divisors (see below), whose sum is σ = 91441970160. Its totient is φ = 45720985076.

The previous prime is 68581477609. The next prime is 68581477619. The reversal of 68581477617 is 71677418586.

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 68581477617 - 2³ = 68581477609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68581477619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11430246267 + ... + 11430246272.

It is an arithmetic number, because the mean of its divisors is an integer number (22860492540).

Almost surely, 2^68581477617 is an apocalyptic number.

It is an amenable number.

68581477617 is a deficient number, since it is larger than the sum of its proper divisors (22860492543).

68581477617 is a wasteful number, since it uses less digits than its factorization.

68581477617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22860492542.

The product of its digits is 15805440, while the sum is 60.

The spelling of 68581477617 in words is "sixty-eight billion, five hundred eighty-one million, four hundred seventy-seven thousand, six hundred seventeen".