666537 has 8 divisors (see below), whose sum is σ = 910560. Its totient is φ = 433440.

The previous prime is 666529. The next prime is 666541. The reversal of 666537 is 735666.

666537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 666537 - 2³ = 666529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666498 and 666507.

It is not an unprimeable number, because it can be changed into a prime (666527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2587 + ... + 2832.

It is an arithmetic number, because the mean of its divisors is an integer number (113820).

2⁶⁶⁶⁵³⁷ is an apocalyptic number.

It is an amenable number.

666537 is a deficient number, since it is larger than the sum of its proper divisors (244023).

666537 is a wasteful number, since it uses less digits than its factorization.

666537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463.

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

The square root of 666537 is about 816.4171727738. The cubic root of 666537 is about 87.3523823930.

The spelling of 666537 in words is "six hundred sixty-six thousand, five hundred thirty-seven".