667523 has 8 divisors (see below), whose sum is σ = 702336. Its totient is φ = 633600.

The previous prime is 667519. The next prime is 667531. The reversal of 667523 is 325766.

667523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667523 - 2² = 667519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1715 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (87792).

2⁶⁶⁷⁵²³ is an apocalyptic number.

667523 is a deficient number, since it is larger than the sum of its proper divisors (34813).

667523 is a wasteful number, since it uses less digits than its factorization.

667523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its digits is 7560, while the sum is 29.

The square root of 667523 is about 817.0208075686. The cubic root of 667523 is about 87.3954342736.

The spelling of 667523 in words is "six hundred sixty-seven thousand, five hundred twenty-three".