666237 has 16 divisors (see below), whose sum is σ = 1044288. Its totient is φ = 372480.

The previous prime is 666233. The next prime is 666269. The reversal of 666237 is 732666.

It is not a de Polignac number, because 666237 - 2² = 666233 is a prime.

666237 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (65268).

2⁶⁶⁶²³⁷ is an apocalyptic number.

It is an amenable number.

666237 is a deficient number, since it is larger than the sum of its proper divisors (378051).

666237 is a wasteful number, since it uses less digits than its factorization.

666237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580.

The product of its digits is 9072, while the sum is 30.

The square root of 666237 is about 816.2334224963. The cubic root of 666237 is about 87.3392750200.

It can be divided in two parts, 666 and 237, that added together give a triangular number (903 = T₄₂).

The spelling of 666237 in words is "six hundred sixty-six thousand, two hundred thirty-seven".