189770997108 has 432 divisors, whose sum is σ = 589595596800. Its totient is φ = 47281449600.

The previous prime is 189770997107. The next prime is 189770997113. The reversal of 189770997108 is 801799077981.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189770997107) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 306576423 + ... + 306577041.

Almost surely, 2^189770997108 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 189770997108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294797798400).

189770997108 is an abundant number, since it is smaller than the sum of its proper divisors (399824599692).

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

189770997108 is a wasteful number, since it uses less digits than its factorization.

189770997108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 66.

The spelling of 189770997108 in words is "one hundred eighty-nine billion, seven hundred seventy million, nine hundred ninety-seven thousand, one hundred eight".