66143181 has 16 divisors (see below), whose sum is σ = 98040320. Its totient is φ = 39389760.

The previous prime is 66143179. The next prime is 66143197. The reversal of 66143181 is 18134166.

It is not a de Polignac number, because 66143181 - 2¹ = 66143179 is a prime.

It is a super-2 number, since 2×66143181² = 8749840785597522, 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 (66143111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26146 + ... + 28563.

It is an arithmetic number, because the mean of its divisors is an integer number (6127520).

Almost surely, 2^66143181 is an apocalyptic number.

It is an amenable number.

66143181 is a deficient number, since it is larger than the sum of its proper divisors (31897139).

66143181 is a wasteful number, since it uses less digits than its factorization.

66143181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54756.

The product of its digits is 3456, while the sum is 30.

The square root of 66143181 is about 8132.8458118914. The cubic root of 66143181 is about 404.4160277508.

The spelling of 66143181 in words is "sixty-six million, one hundred forty-three thousand, one hundred eighty-one".