189156818190 has 128 divisors (see below), whose sum is σ = 479980131840. Its totient is φ = 47576567808.

The previous prime is 189156818167. The next prime is 189156818197. The reversal of 189156818190 is 91818651981.

It is a super-2 number, since 2×189156818190² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 189156818190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189156818197) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 208551717 + ... + 208552623.

It is an arithmetic number, because the mean of its divisors is an integer number (3749844780).

Almost surely, 2^189156818190 is an apocalyptic number.

189156818190 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 189156818190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239990065920).

189156818190 is an abundant number, since it is smaller than the sum of its proper divisors (290823313650).

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

189156818190 is a wasteful number, since it uses less digits than its factorization.

189156818190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146.

The product of its (nonzero) digits is 1244160, while the sum is 57.

The spelling of 189156818190 in words is "one hundred eighty-nine billion, one hundred fifty-six million, eight hundred eighteen thousand, one hundred ninety".