68917211593821 has 6 divisors (see below), whose sum is σ = 99547083413310. Its totient is φ = 45944807729208.

The previous prime is 68917211593799. The next prime is 68917211593831. The reversal of 68917211593821 is 12839511271986.

68917211593821 is a `hidden beast` number, since 6 + 8 + 9 + 1 + 7 + 2 + 11 + 593 + 8 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63454941471321 + 5462270122500 = 7965861^2 + 2337150^2 .

It is not a de Polignac number, because 68917211593821 - 2¹⁸ = 68917211331677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68917211593831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3828733977426 + ... + 3828733977443.

It is an arithmetic number, because the mean of its divisors is an integer number (16591180568885).

Almost surely, 2^{68917211593821} is an apocalyptic number.

It is an amenable number.

68917211593821 is a deficient number, since it is larger than the sum of its proper divisors (30629871819489).

68917211593821 is a wasteful number, since it uses less digits than its factorization.

68917211593821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7657467954875 (or 7657467954872 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 63.

The spelling of 68917211593821 in words is "sixty-eight trillion, nine hundred seventeen billion, two hundred eleven million, five hundred ninety-three thousand, eight hundred twenty-one".