181648564 has 6 divisors (see below), whose sum is σ = 317884994. Its totient is φ = 90824280.

The previous prime is 181648559. The next prime is 181648583. The reversal of 181648564 is 465846181.

It can be written as a sum of positive squares in only one way, i.e., 166203664 + 15444900 = 12892^2 + 3930^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 181648564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22706067 + ... + 22706074.

Almost surely, 2^181648564 is an apocalyptic number.

It is an amenable number.

181648564 is a deficient number, since it is larger than the sum of its proper divisors (136236430).

181648564 is a wasteful number, since it uses less digits than its factorization.

181648564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45412145 (or 45412143 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The square root of 181648564 is about 13477.7061846592. The cubic root of 181648564 is about 566.3401128136.

The spelling of 181648564 in words is "one hundred eighty-one million, six hundred forty-eight thousand, five hundred sixty-four".