666570 has 32 divisors (see below), whose sum is σ = 1695168. Its totient is φ = 167168.

The previous prime is 666559. The next prime is 666599. The reversal of 666570 is 75666.

666570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144 + ... + 1163.

It is an arithmetic number, because the mean of its divisors is an integer number (52974).

2⁶⁶⁶⁵⁷⁰ is an apocalyptic number.

666570 is an abundant number, since it is smaller than the sum of its proper divisors (1028598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666570 is a wasteful number, since it uses less digits than its factorization.

666570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 666570 is about 816.4373827796. The cubic root of 666570 is about 87.3538239640.

The spelling of 666570 in words is "six hundred sixty-six thousand, five hundred seventy".