188668521839 has 4 divisors (see below), whose sum is σ = 215621167824. Its totient is φ = 161715875856.

The previous prime is 188668521751. The next prime is 188668521841. The reversal of 188668521839 is 938125866881.

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 188668521839 - 2⁸ = 188668521583 is a prime.

It is a super-2 number, since 2×188668521839² (a number of 23 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 (188668521539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13476322982 + ... + 13476322995.

It is an arithmetic number, because the mean of its divisors is an integer number (53905291956).

Almost surely, 2^188668521839 is an apocalyptic number.

188668521839 is a deficient number, since it is larger than the sum of its proper divisors (26952645985).

188668521839 is an equidigital number, since it uses as much as digits as its factorization.

188668521839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26952645984.

The product of its digits is 39813120, while the sum is 65.

The spelling of 188668521839 in words is "one hundred eighty-eight billion, six hundred sixty-eight million, five hundred twenty-one thousand, eight hundred thirty-nine".