551668 has 18 divisors (see below), whose sum is σ = 1049874. Its totient is φ = 252144.

The previous prime is 551659. The next prime is 551671. The reversal of 551668 is 866155.

551668 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 only one way, i.e., 381924 + 169744 = 618^2 + 412^2 .

It is a congruent number.

It is an unprimeable number.

551668 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 5 ways as a sum of consecutive naturals, for example, 5305 + ... + 5407.

2⁵⁵¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

551668 is a deficient number, since it is larger than the sum of its proper divisors (498206).

551668 is a wasteful number, since it uses less digits than its factorization.

551668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 118 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 551668 is about 742.7435627456. The cubic root of 551668 is about 82.0148694034.

The spelling of 551668 in words is "five hundred fifty-one thousand, six hundred sixty-eight".