266642 has 4 divisors (see below), whose sum is σ = 399966. Its totient is φ = 133320.

The previous prime is 266641. The next prime is 266647. The reversal of 266642 is 246662.

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., 177241 + 89401 = 421^2 + 299^2 .

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (266641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66659 + ... + 66662.

2²⁶⁶⁶⁴² is an apocalyptic number.

266642 is a deficient number, since it is larger than the sum of its proper divisors (133324).

266642 is a wasteful number, since it uses less digits than its factorization.

266642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133323.

The product of its digits is 3456, while the sum is 26.

The square root of 266642 is about 516.3738955447. The cubic root of 266642 is about 64.3639742954.

The spelling of 266642 in words is "two hundred sixty-six thousand, six hundred forty-two".