667545 has 16 divisors (see below), whose sum is σ = 1078272. Its totient is φ = 352640.

The previous prime is 667531. The next prime is 667547. The reversal of 667545 is 545766.

It is not a de Polignac number, because 667545 - 2⁷ = 667417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2749 + ... + 2981.

It is an arithmetic number, because the mean of its divisors is an integer number (67392).

2⁶⁶⁷⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

667545 is a deficient number, since it is larger than the sum of its proper divisors (410727).

667545 is a wasteful number, since it uses less digits than its factorization.

667545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 25200, while the sum is 33.

The square root of 667545 is about 817.0342710070. The cubic root of 667545 is about 87.3963943795.

The spelling of 667545 in words is "six hundred sixty-seven thousand, five hundred forty-five".