666507 has 16 divisors (see below), whose sum is σ = 944640. Its totient is φ = 417312.

The previous prime is 666493. The next prime is 666511. The reversal of 666507 is 705666.

666507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666507 - 2¹¹ = 664459 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 4008 + ... + 4170.

It is an arithmetic number, because the mean of its divisors is an integer number (59040).

2⁶⁶⁶⁵⁰⁷ is an apocalyptic number.

666507 is a deficient number, since it is larger than the sum of its proper divisors (278133).

666507 is a wasteful number, since it uses less digits than its factorization.

666507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 666507 is about 816.3987996072. The cubic root of 666507 is about 87.3510718327.

The spelling of 666507 in words is "six hundred sixty-six thousand, five hundred seven".