68457555781 has 8 divisors (see below), whose sum is σ = 71560371200. Its totient is φ = 65410647120.

The previous prime is 68457555713. The next prime is 68457555791. The reversal of 68457555781 is 18755575486.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68457555781 - 2⁷ = 68457555653 is a prime.

It is a super-3 number, since 3×68457555781³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68457555791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13974186 + ... + 13979083.

It is an arithmetic number, because the mean of its divisors is an integer number (8945046400).

Almost surely, 2^68457555781 is an apocalyptic number.

It is an amenable number.

68457555781 is a deficient number, since it is larger than the sum of its proper divisors (3102815419).

68457555781 is a wasteful number, since it uses less digits than its factorization.

68457555781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27953379.

The product of its digits is 47040000, while the sum is 61.

The spelling of 68457555781 in words is "sixty-eight billion, four hundred fifty-seven million, five hundred fifty-five thousand, seven hundred eighty-one".