181663144 has 16 divisors (see below), whose sum is σ = 366820020. Its totient is φ = 83844480.

The previous prime is 181663129. The next prime is 181663147. The reversal of 181663144 is 441366181.

It can be written as a sum of positive squares in 2 ways, for example, as 127464100 + 54199044 = 11290^2 + 7362^2 .

It is not an unprimeable number, because it can be changed into a prime (181663147) 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, 873277 + ... + 873484.

Almost surely, 2^181663144 is an apocalyptic number.

It is an amenable number.

181663144 is an abundant number, since it is smaller than the sum of its proper divisors (185156876).

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

181663144 is a wasteful number, since it uses less digits than its factorization.

181663144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746780 (or 1746776 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 181663144 is about 13478.2470670336. The cubic root of 181663144 is about 566.3552648151.

The spelling of 181663144 in words is "one hundred eighty-one million, six hundred sixty-three thousand, one hundred forty-four".