181066638 has 8 divisors (see below), whose sum is σ = 362133288. Its totient is φ = 60355544.

The previous prime is 181066573. The next prime is 181066651. The reversal of 181066638 is 836660181.

It is a sphenic number, since it is the product of 3 distinct primes.

181066638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 181066596 and 181066605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15088881 + ... + 15088892.

It is an arithmetic number, because the mean of its divisors is an integer number (45266661).

Almost surely, 2^181066638 is an apocalyptic number.

181066638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

181066638 is a wasteful number, since it uses less digits than its factorization.

181066638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30177778.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 181066638 is about 13456.1004009334. The cubic root of 181066638 is about 565.7346935916.

The spelling of 181066638 in words is "one hundred eighty-one million, sixty-six thousand, six hundred thirty-eight".