181664484 has 12 divisors (see below), whose sum is σ = 423883824. Its totient is φ = 60554824.

The previous prime is 181664479. The next prime is 181664489. The reversal of 181664484 is 484466181.

It is an interprime number because it is at equal distance from previous prime (181664479) and next prime (181664489).

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

It is not an unprimeable number, because it can be changed into a prime (181664489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7569342 + ... + 7569365.

It is an arithmetic number, because the mean of its divisors is an integer number (35323652).

Almost surely, 2^181664484 is an apocalyptic number.

It is an amenable number.

181664484 is an abundant number, since it is smaller than the sum of its proper divisors (242219340).

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

181664484 is a wasteful number, since it uses less digits than its factorization.

181664484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15138714 (or 15138712 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 181664484 is about 13478.2967766703. The cubic root of 181664484 is about 566.3566573452.

The spelling of 181664484 in words is "one hundred eighty-one million, six hundred sixty-four thousand, four hundred eighty-four".