181660864 has 112 divisors (see below), whose sum is σ = 454127616. Its totient is φ = 70041600.

The previous prime is 181660859. The next prime is 181660889. The reversal of 181660864 is 468066181.

181660864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941152 + ... + 941344.

Almost surely, 2^181660864 is an apocalyptic number.

181660864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181660864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227063808).

181660864 is an abundant number, since it is smaller than the sum of its proper divisors (272466752).

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

181660864 is a wasteful number, since it uses less digits than its factorization.

181660864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 181660864 is about 13478.1624860364. The cubic root of 181660864 is about 566.3528954198.

The spelling of 181660864 in words is "one hundred eighty-one million, six hundred sixty thousand, eight hundred sixty-four".