660969 has 9 divisors (see below), whose sum is σ = 958269. Its totient is φ = 439020.

The previous prime is 660949. The next prime is 660973. The reversal of 660969 is 969066.

The square root of 660969 is 813.

It is a perfect power (a square), and thus also a powerful number.

660969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-660969 is a prime.

It is a super-2 number, since 2×660969² = 873760037922, which contains 22 as substring.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660969.

It is not an unprimeable number, because it can be changed into a prime (660949) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2304 + ... + 2574.

2⁶⁶⁰⁹⁶⁹ is an apocalyptic number.

660969 is the 813-rd square number.

660969 is the 407-th centered octagonal number.

It is an amenable number.

660969 is a deficient number, since it is larger than the sum of its proper divisors (297300).

660969 is an equidigital number, since it uses as much as digits as its factorization.

660969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The cubic root of 660969 is about 87.1084655884.

Multiplying 660969 by its sum of digits (36), we get a square (23794884 = 4878²).

The spelling of 660969 in words is "six hundred sixty thousand, nine hundred sixty-nine".