537666 has 8 divisors (see below), whose sum is σ = 1075344. Its totient is φ = 179220.

The previous prime is 537661. The next prime is 537673. The reversal of 537666 is 666735.

It is a sphenic number, since it is the product of 3 distinct primes.

537666 is an admirable number.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 537666.

It is not an unprimeable number, because it can be changed into a prime (537661) by changing a digit.

537666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44800 + ... + 44811.

It is an arithmetic number, because the mean of its divisors is an integer number (134418).

2⁵³⁷⁶⁶⁶ is an apocalyptic number.

537666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

537666 is a wasteful number, since it uses less digits than its factorization.

537666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89616.

The product of its digits is 22680, while the sum is 33.

The square root of 537666 is about 733.2571172515. The cubic root of 537666 is about 81.3150358971.

The spelling of 537666 in words is "five hundred thirty-seven thousand, six hundred sixty-six".