166558181 has 8 divisors (see below), whose sum is σ = 169915680. Its totient is φ = 163226448.

The previous prime is 166558169. The next prime is 166558321. The reversal of 166558181 is 181855661.

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 166558181 - 2¹⁴ = 166541797 is a prime.

It is a super-2 number, since 2×166558181² = 55483255316057522, 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 (166558141) 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, 6890 + ... + 19508.

It is an arithmetic number, because the mean of its divisors is an integer number (21239460).

Almost surely, 2^166558181 is an apocalyptic number.

It is an amenable number.

166558181 is a deficient number, since it is larger than the sum of its proper divisors (3357499).

166558181 is a wasteful number, since it uses less digits than its factorization.

166558181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12883.

The product of its digits is 57600, while the sum is 41.

The square root of 166558181 is about 12905.7421716072. The cubic root of 166558181 is about 550.2017783062.

The spelling of 166558181 in words is "one hundred sixty-six million, five hundred fifty-eight thousand, one hundred eighty-one".