189819780173 has 8 divisors (see below), whose sum is σ = 195801363480. Its totient is φ = 183883003200.

The previous prime is 189819780077. The next prime is 189819780179. The reversal of 189819780173 is 371087918981.

It is a happy number.

189819780173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 130243757449 + 59576022724 = 360893^2 + 244082^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189819780173 - 2²⁴ = 189803002957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189819780179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11192978 + ... + 11209923.

It is an arithmetic number, because the mean of its divisors is an integer number (24475170435).

Almost surely, 2^189819780173 is an apocalyptic number.

It is an amenable number.

189819780173 is a deficient number, since it is larger than the sum of its proper divisors (5981583307).

189819780173 is a wasteful number, since it uses less digits than its factorization.

189819780173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22403167.

The product of its (nonzero) digits is 6096384, while the sum is 62.

The spelling of 189819780173 in words is "one hundred eighty-nine billion, eight hundred nineteen million, seven hundred eighty thousand, one hundred seventy-three".