181325166 has 16 divisors (see below), whose sum is σ = 395618688. Its totient is φ = 54947000.

The previous prime is 181325149. The next prime is 181325173. The reversal of 181325166 is 661523181.

181325166 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1373610 + ... + 1373741.

It is an arithmetic number, because the mean of its divisors is an integer number (24726168).

Almost surely, 2^181325166 is an apocalyptic number.

181325166 is an abundant number, since it is smaller than the sum of its proper divisors (214293522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181325166 is a wasteful number, since it uses less digits than its factorization.

181325166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747367.

The product of its digits is 8640, while the sum is 33.

The square root of 181325166 is about 13465.7033236293. The cubic root of 181325166 is about 566.0038186426.

The spelling of 181325166 in words is "one hundred eighty-one million, three hundred twenty-five thousand, one hundred sixty-six".