660667 has 12 divisors (see below), whose sum is σ = 782040. Its totient is φ = 556416.

The previous prime is 660661. The next prime is 660683. The reversal of 660667 is 766066.

It is a happy number.

660667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660667 - 2³ = 660659 is a prime.

660667 is a lucky number.

It is a nialpdrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660667.

It is not an unprimeable number, because it can be changed into a prime (660661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4684 + ... + 4822.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2⁶⁶⁰⁶⁶⁷ is an apocalyptic number.

660667 is a deficient number, since it is larger than the sum of its proper divisors (121373).

660667 is a wasteful number, since it uses less digits than its factorization.

660667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 660667 is about 812.8142469224. The cubic root of 660667 is about 87.0951968046.

The spelling of 660667 in words is "six hundred sixty thousand, six hundred sixty-seven".