667566 has 12 divisors (see below), whose sum is σ = 1446432. Its totient is φ = 222516.

The previous prime is 667561. The next prime is 667577. The reversal of 667566 is 665766.

It is a self number, because there is not a number n which added to its sum of digits gives 667566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667561) by changing a digit.

667566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18526 + ... + 18561.

It is an arithmetic number, because the mean of its divisors is an integer number (120536).

2⁶⁶⁷⁵⁶⁶ is an apocalyptic number.

667566 is an abundant number, since it is smaller than the sum of its proper divisors (778866).

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

667566 is a wasteful number, since it uses less digits than its factorization.

667566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37095 (or 37092 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 667566 is about 817.0471222641. The cubic root of 667566 is about 87.3973108246.

The spelling of 667566 in words is "six hundred sixty-seven thousand, five hundred sixty-six".