181035666 has 48 divisors (see below), whose sum is σ = 449951424. Its totient is φ = 51531552.

The previous prime is 181035643. The next prime is 181035671. The reversal of 181035666 is 666530181.

It is a happy number.

181035666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 181035666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33120 + ... + 38196.

It is an arithmetic number, because the mean of its divisors is an integer number (9373988).

Almost surely, 2^181035666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181035666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224975712).

181035666 is an abundant number, since it is smaller than the sum of its proper divisors (268915758).

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

181035666 is a wasteful number, since it uses less digits than its factorization.

181035666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375 (or 5372 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 181035666 is about 13454.9494982330. The cubic root of 181035666 is about 565.7024348713.

The spelling of 181035666 in words is "one hundred eighty-one million, thirty-five thousand, six hundred sixty-six".