166153231 has 4 divisors (see below), whose sum is σ = 166183600. Its totient is φ = 166122864.

The previous prime is 166153213. The next prime is 166153237. The reversal of 166153231 is 132351661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132351661 = 13 ⋅10180897.

It is a cyclic number.

It is not a de Polignac number, because 166153231 - 2⁹ = 166152719 is a prime.

It is a super-2 number, since 2×166153231² = 55213792343478722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166153231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166153237) 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, 4446 + ... + 18763.

It is an arithmetic number, because the mean of its divisors is an integer number (41545900).

Almost surely, 2^166153231 is an apocalyptic number.

166153231 is a deficient number, since it is larger than the sum of its proper divisors (30369).

166153231 is an equidigital number, since it uses as much as digits as its factorization.

166153231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30368.

The product of its digits is 3240, while the sum is 28.

The square root of 166153231 is about 12890.0438711433. The cubic root of 166153231 is about 549.7555177868.

The spelling of 166153231 in words is "one hundred sixty-six million, one hundred fifty-three thousand, two hundred thirty-one".