665596642 has 12 divisors (see below), whose sum is σ = 1001984598. Its totient is φ = 331604000.

The previous prime is 665596627. The next prime is 665596651. The reversal of 665596642 is 246695566.

665596642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 365995161 + 299601481 = 19131^2 + 17309^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 730167 + ... + 731077.

Almost surely, 2^665596642 is an apocalyptic number.

665596642 is a deficient number, since it is larger than the sum of its proper divisors (336387956).

665596642 is an frugal number, since it uses more digits than its factorization.

665596642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225 (or 1314 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 49.

The square root of 665596642 is about 25799.1597149985. The cubic root of 665596642 is about 873.1128381382.

The spelling of 665596642 in words is "six hundred sixty-five million, five hundred ninety-six thousand, six hundred forty-two".