666516 has 24 divisors (see below), whose sum is σ = 1580320. Its totient is φ = 218592.

The previous prime is 666511. The next prime is 666527. The reversal of 666516 is 615666.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666516.

It is not an unprimeable number, because it can be changed into a prime (666511) by changing a digit.

666516 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 7 ways as a sum of consecutive naturals, for example, 390 + ... + 1218.

2⁶⁶⁶⁵¹⁶ is an apocalyptic number.

It is an amenable number.

666516 is an abundant number, since it is smaller than the sum of its proper divisors (913804).

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

666516 is a wasteful number, since it uses less digits than its factorization.

666516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903 (or 901 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 666516 is about 816.4043116006. The cubic root of 666516 is about 87.3514650050.

The spelling of 666516 in words is "six hundred sixty-six thousand, five hundred sixteen".