189163791780 has 96 divisors (see below), whose sum is σ = 534134092800. Its totient is φ = 50018871168.

The previous prime is 189163791737. The next prime is 189163791797. The reversal of 189163791780 is 87197361981.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4271391 + ... + 4315449.

It is an arithmetic number, because the mean of its divisors is an integer number (5563896800).

Almost surely, 2^189163791780 is an apocalyptic number.

189163791780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189163791780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267067046400).

189163791780 is an abundant number, since it is smaller than the sum of its proper divisors (344970301020).

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

189163791780 is a wasteful number, since it uses less digits than its factorization.

189163791780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44673 (or 44671 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 60.

The spelling of 189163791780 in words is "one hundred eighty-nine billion, one hundred sixty-three million, seven hundred ninety-one thousand, seven hundred eighty".