189869961107808 has 144 divisors (see below), whose sum is σ = 543585996954000. Its totient is φ = 62862964669440.

The previous prime is 189869961107791. The next prime is 189869961107833. The reversal of 189869961107808 is 808701169968981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1545242598 + ... + 1545365466.

It is an arithmetic number, because the mean of its divisors is an integer number (3774902756625).

Almost surely, 2^{189869961107808} is an apocalyptic number.

189869961107808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189869961107808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271792998477000).

189869961107808 is an abundant number, since it is smaller than the sum of its proper divisors (353716035846192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189869961107808 is a wasteful number, since it uses less digits than its factorization.

189869961107808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159045 (or 159034 counting only the distinct ones).

The product of its (nonzero) digits is 752467968, while the sum is 81.

The spelling of 189869961107808 in words is "one hundred eighty-nine trillion, eight hundred sixty-nine billion, nine hundred sixty-one million, one hundred seven thousand, eight hundred eight".