68438312021871 has 48 divisors (see below), whose sum is σ = 109283153934240. Its totient is φ = 40926705408000.

The previous prime is 68438312021771. The next prime is 68438312021929. The reversal of 68438312021871 is 17812021383486.

68438312021871 is a `hidden beast` number, since 6 + 8 + 43 + 8 + 312 + 0 + 218 + 71 = 666.

It is not a de Polignac number, because 68438312021871 - 2¹³ = 68438312013679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68438312021371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10557390 + ... + 15758651.

It is an arithmetic number, because the mean of its divisors is an integer number (2276732373630).

Almost surely, 2^{68438312021871} is an apocalyptic number.

68438312021871 is a deficient number, since it is larger than the sum of its proper divisors (40844841912369).

68438312021871 is a wasteful number, since it uses less digits than its factorization.

68438312021871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26316408 (or 26316405 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 68438312021871 in words is "sixty-eight trillion, four hundred thirty-eight billion, three hundred twelve million, twenty-one thousand, eight hundred seventy-one".