666016 has 24 divisors (see below), whose sum is σ = 1412964. Its totient is φ = 307200.

The previous prime is 666013. The next prime is 666019. The reversal of 666016 is 610666.

It is an interprime number because it is at equal distance from previous prime (666013) and next prime (666019).

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 19600 = 804^2 + 140^2 .

It is not an unprimeable number, because it can be changed into a prime (666013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385 + ... + 1216.

2⁶⁶⁶⁰¹⁶ is an apocalyptic number.

It is an amenable number.

666016 is an abundant number, since it is smaller than the sum of its proper divisors (746948).

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

666016 is a wasteful number, since it uses less digits than its factorization.

666016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1616 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 666016 is about 816.0980333269. The cubic root of 666016 is about 87.3296167380.

The spelling of 666016 in words is "six hundred sixty-six thousand, sixteen".