551666 has 8 divisors (see below), whose sum is σ = 835164. Its totient is φ = 273280.

The previous prime is 551659. The next prime is 551671. The reversal of 551666 is 666155.

551666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 395641 + 156025 = 629^2 + 395^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995 + ... + 1446.

2⁵⁵¹⁶⁶⁶ is an apocalyptic number.

551666 is a deficient number, since it is larger than the sum of its proper divisors (283498).

551666 is a wasteful number, since it uses less digits than its factorization.

551666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556.

The product of its digits is 5400, while the sum is 29.

The square root of 551666 is about 742.7422163847. The cubic root of 551666 is about 82.0147702919.

The spelling of 551666 in words is "five hundred fifty-one thousand, six hundred sixty-six".