166840567189 has 4 divisors (see below), whose sum is σ = 166895075500. Its totient is φ = 166786058880.

The previous prime is 166840567097. The next prime is 166840567199. The reversal of 166840567189 is 981765048661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134126610289 + 32713956900 = 366233^2 + 180870^2 .

It is a cyclic number.

It is not a de Polignac number, because 166840567189 - 2²¹ = 166838470037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166840567199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27249564 + ... + 27255685.

It is an arithmetic number, because the mean of its divisors is an integer number (41723768875).

Almost surely, 2^166840567189 is an apocalyptic number.

It is an amenable number.

166840567189 is a deficient number, since it is larger than the sum of its proper divisors (54508311).

166840567189 is an equidigital number, since it uses as much as digits as its factorization.

166840567189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54508310.

The product of its (nonzero) digits is 17418240, while the sum is 61.

The spelling of 166840567189 in words is "one hundred sixty-six billion, eight hundred forty million, five hundred sixty-seven thousand, one hundred eighty-nine".