666534 has 16 divisors (see below), whose sum is σ = 1454400. Its totient is φ = 201960.

The previous prime is 666529. The next prime is 666541. The reversal of 666534 is 435666.

666534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

666534 is a modest number, since divided by 6534 gives 66 as remainder.

It is a congruent number.

It is an unprimeable number.

666534 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 7 ways as a sum of consecutive naturals, for example, 4984 + ... + 5115.

It is an arithmetic number, because the mean of its divisors is an integer number (90900).

2⁶⁶⁶⁵³⁴ is an apocalyptic number.

666534 is an abundant number, since it is smaller than the sum of its proper divisors (787866).

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

666534 is a wasteful number, since it uses less digits than its factorization.

666534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10115.

The product of its digits is 12960, while the sum is 30.

The square root of 666534 is about 816.4153354758. The cubic root of 666534 is about 87.3522513388.

The spelling of 666534 in words is "six hundred sixty-six thousand, five hundred thirty-four".