68857122171781 has 8 divisors (see below), whose sum is σ = 69132165228000. Its totient is φ = 68582084766000.

The previous prime is 68857122171737. The next prime is 68857122171829. The reversal of 68857122171781 is 18717122175886.

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 68857122171781 - 2⁷ = 68857122171653 is a prime.

It is a super-2 number, since 2×68857122171781² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68857122171731) 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, 23913315 + ... + 26637583.

It is an arithmetic number, because the mean of its divisors is an integer number (8641520653500).

Almost surely, 2^{68857122171781} is an apocalyptic number.

It is an amenable number.

68857122171781 is a deficient number, since it is larger than the sum of its proper divisors (275043056219).

68857122171781 is a wasteful number, since it uses less digits than its factorization.

68857122171781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825219.

The product of its digits is 21073920, while the sum is 64.

The spelling of 68857122171781 in words is "sixty-eight trillion, eight hundred fifty-seven billion, one hundred twenty-two million, one hundred seventy-one thousand, seven hundred eighty-one".