511666 has 16 divisors (see below), whose sum is σ = 826200. Its totient is φ = 236800.

The previous prime is 511633. The next prime is 511669. The reversal of 511666 is 666115.

It can be written as a sum of positive squares in 4 ways, for example, as 497025 + 14641 = 705^2 + 121^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 511666.

It is not an unprimeable number, because it can be changed into a prime (511669) by changing a digit.

511666 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, 3360 + ... + 3508.

2⁵¹¹⁶⁶⁶ is an apocalyptic number.

511666 is a deficient number, since it is larger than the sum of its proper divisors (314534).

511666 is a wasteful number, since it uses less digits than its factorization.

511666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269.

The product of its digits is 1080, while the sum is 25.

The square root of 511666 is about 715.3083251298. The cubic root of 511666 is about 79.9826003826.

Subtracting 511666 from its reverse (666115), we obtain a square (154449 = 393²).

The spelling of 511666 in words is "five hundred eleven thousand, six hundred sixty-six".