189177198990 has 192 divisors, whose sum is σ = 521228224512. Its totient is φ = 43845235200.

The previous prime is 189177198941. The next prime is 189177199037. The reversal of 189177198990 is 99891771981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5799025 + ... + 5831555.

It is an arithmetic number, because the mean of its divisors is an integer number (2714730336).

Almost surely, 2^189177198990 is an apocalyptic number.

189177198990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189177198990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260614112256).

189177198990 is an abundant number, since it is smaller than the sum of its proper divisors (332051025522).

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

189177198990 is a wasteful number, since it uses less digits than its factorization.

189177198990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32635 (or 32622 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 69.

The spelling of 189177198990 in words is "one hundred eighty-nine billion, one hundred seventy-seven million, one hundred ninety-eight thousand, nine hundred ninety".