68517453887 has 4 divisors (see below), whose sum is σ = 68529584376. Its totient is φ = 68505323400.

The previous prime is 68517453883. The next prime is 68517453899. The reversal of 68517453887 is 78835471586.

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

It is a cyclic number.

It is not a de Polignac number, because 68517453887 - 2² = 68517453883 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 (68517453883) 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, 6056768 + ... + 6068069.

It is an arithmetic number, because the mean of its divisors is an integer number (17132396094).

Almost surely, 2^68517453887 is an apocalyptic number.

68517453887 is a deficient number, since it is larger than the sum of its proper divisors (12130489).

68517453887 is a wasteful number, since it uses less digits than its factorization.

68517453887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12130488.

The product of its digits is 45158400, while the sum is 62.

The spelling of 68517453887 in words is "sixty-eight billion, five hundred seventeen million, four hundred fifty-three thousand, eight hundred eighty-seven".