68457173887 has 4 divisors (see below), whose sum is σ = 70817766120. Its totient is φ = 66096581656.

The previous prime is 68457173839. The next prime is 68457173909. The reversal of 68457173887 is 78837175486.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68457173887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68457113887) 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, 1180296073 + ... + 1180296130.

It is an arithmetic number, because the mean of its divisors is an integer number (17704441530).

Almost surely, 2^68457173887 is an apocalyptic number.

68457173887 is a deficient number, since it is larger than the sum of its proper divisors (2360592233).

68457173887 is a wasteful number, since it uses less digits than its factorization.

68457173887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360592232.

The product of its digits is 63221760, while the sum is 64.

The spelling of 68457173887 in words is "sixty-eight billion, four hundred fifty-seven million, one hundred seventy-three thousand, eight hundred eighty-seven".