166642231 has 8 divisors (see below), whose sum is σ = 190544384. Its totient is φ = 142764120.

The previous prime is 166642219. The next prime is 166642249. The reversal of 166642231 is 132246661.

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

It is a cyclic number.

It is not a de Polignac number, because 166642231 - 2⁹ = 166641719 is a prime.

It is a super-2 number, since 2×166642231² = 55539266305314722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166642193 and 166642202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166642261) 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, 12766 + ... + 22276.

It is an arithmetic number, because the mean of its divisors is an integer number (23818048).

Almost surely, 2^166642231 is an apocalyptic number.

166642231 is a deficient number, since it is larger than the sum of its proper divisors (23902153).

166642231 is an equidigital number, since it uses as much as digits as its factorization.

166642231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12021.

The product of its digits is 10368, while the sum is 31.

The square root of 166642231 is about 12908.9980633665. The cubic root of 166642231 is about 550.2943119034.

Adding to 166642231 its reverse (132246661), we get a palindrome (298888892).

The spelling of 166642231 in words is "one hundred sixty-six million, six hundred forty-two thousand, two hundred thirty-one".