660669 has 8 divisors (see below), whose sum is σ = 886272. Its totient is φ = 437760.

The previous prime is 660661. The next prime is 660683. The reversal of 660669 is 966066.

660669 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 not a de Polignac number, because 660669 - 2³ = 660661 is a prime.

It is a super-2 number, since 2×660669² = 872967055122, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4 + ... + 1149.

It is an arithmetic number, because the mean of its divisors is an integer number (110784).

2⁶⁶⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

660669 is a deficient number, since it is larger than the sum of its proper divisors (225603).

660669 is a wasteful number, since it uses less digits than its factorization.

660669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 660669 is about 812.8154772148. The cubic root of 660669 is about 87.0952846907.

The spelling of 660669 in words is "six hundred sixty thousand, six hundred sixty-nine".