181006866 has 64 divisors (see below), whose sum is σ = 415324800. Its totient is φ = 58399488.

The previous prime is 181006843. The next prime is 181006873. The reversal of 181006866 is 668600181.

It is a self number, because there is not a number n which added to its sum of digits gives 181006866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317830 + ... + 318398.

It is an arithmetic number, because the mean of its divisors is an integer number (6489450).

Almost surely, 2^181006866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181006866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207662400).

181006866 is an abundant number, since it is smaller than the sum of its proper divisors (234317934).

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

181006866 is a wasteful number, since it uses less digits than its factorization.

181006866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760 (or 754 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 181006866 is about 13453.8792175342. The cubic root of 181006866 is about 565.6724350845.

The spelling of 181006866 in words is "one hundred eighty-one million, six thousand, eight hundred sixty-six".