181611066 has 64 divisors (see below), whose sum is σ = 448616448. Its totient is φ = 47729088.

The previous prime is 181611061. The next prime is 181611097. The reversal of 181611066 is 660116181.

It is a happy number.

181611066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (181611061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265561 + ... + 266243.

It is an arithmetic number, because the mean of its divisors is an integer number (7009632).

Almost surely, 2^181611066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181611066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224308224).

181611066 is an abundant number, since it is smaller than the sum of its proper divisors (267005382).

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

181611066 is a wasteful number, since it uses less digits than its factorization.

181611066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 181611066 is about 13476.3150007708. The cubic root of 181611066 is about 566.3011399704.

The spelling of 181611066 in words is "one hundred eighty-one million, six hundred eleven thousand, sixty-six".