665538824 has 16 divisors (see below), whose sum is σ = 1248307200. Its totient is φ = 332656912.

The previous prime is 665538791. The next prime is 665538829. The reversal of 665538824 is 428835566.

It is a super-3 number, since 3×665538824³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (665538829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14489 + ... + 39255.

It is an arithmetic number, because the mean of its divisors is an integer number (78019200).

Almost surely, 2^665538824 is an apocalyptic number.

It is an amenable number.

665538824 is a deficient number, since it is larger than the sum of its proper divisors (582768376).

665538824 is a wasteful number, since it uses less digits than its factorization.

665538824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28132 (or 28128 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 47.

The square root of 665538824 is about 25798.0391502920. The cubic root of 665538824 is about 873.0875560095.

The spelling of 665538824 in words is "six hundred sixty-five million, five hundred thirty-eight thousand, eight hundred twenty-four".