189991855312 has 80 divisors (see below), whose sum is σ = 424876948992. Its totient is φ = 80616816000.

The previous prime is 189991855307. The next prime is 189991855343. The reversal of 189991855312 is 213558199981.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26972463 + ... + 26979505.

Almost surely, 2^189991855312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189991855312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212438474496).

189991855312 is an abundant number, since it is smaller than the sum of its proper divisors (234885093680).

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

189991855312 is a wasteful number, since it uses less digits than its factorization.

189991855312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9416 (or 9410 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 61.

The spelling of 189991855312 in words is "one hundred eighty-nine billion, nine hundred ninety-one million, eight hundred fifty-five thousand, three hundred twelve".