665570 has 32 divisors (see below), whose sum is σ = 1313280. Its totient is φ = 241920.

The previous prime is 665569. The next prime is 665573. The reversal of 665570 is 75566.

665570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665570.

It is not an unprimeable number, because it can be changed into a prime (665573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5834 + ... + 5946.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁶⁶⁵⁵⁷⁰ is an apocalyptic number.

665570 is a deficient number, since it is larger than the sum of its proper divisors (647710).

665570 is a wasteful number, since it uses less digits than its factorization.

665570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 665570 is about 815.8247360800. The cubic root of 665570 is about 87.3101188549.

The spelling of 665570 in words is "six hundred sixty-five thousand, five hundred seventy".