660266 has 4 divisors (see below), whose sum is σ = 990402. Its totient is φ = 330132.

The previous prime is 660251. The next prime is 660271. The reversal of 660266 is 662066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 177241 = 695^2 + 421^2 .

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 660266.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165065 + ... + 165068.

2⁶⁶⁰²⁶⁶ is an apocalyptic number.

660266 is a deficient number, since it is larger than the sum of its proper divisors (330136).

660266 is a wasteful number, since it uses less digits than its factorization.

660266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330135.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 660266 is about 812.5675356547. The cubic root of 660266 is about 87.0775720696.

The spelling of 660266 in words is "six hundred sixty thousand, two hundred sixty-six".