166381869 has 8 divisors (see below), whose sum is σ = 224129920. Its totient is φ = 109777536.

The previous prime is 166381847. The next prime is 166381877. The reversal of 166381869 is 968183661.

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

It is not a de Polignac number, because 166381869 - 2⁷ = 166381741 is a prime.

It is a super-2 number, since 2×166381869² = 55365852663866322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166381769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285589 + ... + 286170.

It is an arithmetic number, because the mean of its divisors is an integer number (28016240).

Almost surely, 2^166381869 is an apocalyptic number.

It is an amenable number.

166381869 is a deficient number, since it is larger than the sum of its proper divisors (57748051).

166381869 is an equidigital number, since it uses as much as digits as its factorization.

166381869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571859.

The product of its digits is 373248, while the sum is 48.

The square root of 166381869 is about 12898.9096050790. The cubic root of 166381869 is about 550.0075690418.

The spelling of 166381869 in words is "one hundred sixty-six million, three hundred eighty-one thousand, eight hundred sixty-nine".