665605522 has 8 divisors (see below), whose sum is σ = 1057138236. Its totient is φ = 313226112.

The previous prime is 665605483. The next prime is 665605547. The reversal of 665605522 is 225506566.

665605522 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 2 ways, for example, as 531717481 + 133888041 = 23059^2 + 11571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9788283 + ... + 9788350.

Almost surely, 2^665605522 is an apocalyptic number.

665605522 is a deficient number, since it is larger than the sum of its proper divisors (391532714).

665605522 is a wasteful number, since it uses less digits than its factorization.

665605522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19576652.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 665605522 is about 25799.3318130528. The cubic root of 665605522 is about 873.1167209741.

The spelling of 665605522 in words is "six hundred sixty-five million, six hundred five thousand, five hundred twenty-two".