189017171730 has 80 divisors (see below), whose sum is σ = 509686734744. Its totient is φ = 50261713920.

The previous prime is 189017171683. The next prime is 189017171747. The reversal of 189017171730 is 37171710981.

It can be written as a sum of positive squares in 4 ways, for example, as 168583326921 + 20433844809 = 410589^2 + 142947^2 .

It is a super-2 number, since 2×189017171730² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 44601 + ... + 616460.

Almost surely, 2^189017171730 is an apocalyptic number.

189017171730 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 189017171730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254843367372).

189017171730 is an abundant number, since it is smaller than the sum of its proper divisors (320669563014).

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

189017171730 is a wasteful number, since it uses less digits than its factorization.

189017171730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661433 (or 661424 counting only the distinct ones).

The product of its (nonzero) digits is 74088, while the sum is 45.

The spelling of 189017171730 in words is "one hundred eighty-nine billion, seventeen million, one hundred seventy-one thousand, seven hundred thirty".