665604724 has 12 divisors (see below), whose sum is σ = 1184551200. Its totient is φ = 327161528.

The previous prime is 665604721. The next prime is 665604749. The reversal of 665604724 is 427406566.

665604724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665604724² = 886059297222232352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665604721) 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, 1409944 + ... + 1410415.

It is an arithmetic number, because the mean of its divisors is an integer number (98712600).

Almost surely, 2^665604724 is an apocalyptic number.

It is an amenable number.

665604724 is a deficient number, since it is larger than the sum of its proper divisors (518946476).

665604724 is a wasteful number, since it uses less digits than its factorization.

665604724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820422 (or 2820420 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 665604724 is about 25799.3163475314. The cubic root of 665604724 is about 873.1163720450.

The spelling of 665604724 in words is "six hundred sixty-five million, six hundred four thousand, seven hundred twenty-four".