181000668 has 12 divisors (see below), whose sum is σ = 422334920. Its totient is φ = 60333552.

The previous prime is 181000667. The next prime is 181000679. The reversal of 181000668 is 866000181.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×181000668² = 65522483632892448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181000663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7541683 + ... + 7541706.

Almost surely, 2^181000668 is an apocalyptic number.

It is an amenable number.

181000668 is an abundant number, since it is smaller than the sum of its proper divisors (241334252).

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

181000668 is a wasteful number, since it uses less digits than its factorization.

181000668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15083396 (or 15083394 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 181000668 is about 13453.6488730753. The cubic root of 181000668 is about 565.6659784643.

The spelling of 181000668 in words is "one hundred eighty-one million, six hundred sixty-eight", and thus it is an aban number.