550000666 has 4 divisors (see below), whose sum is σ = 825001002. Its totient is φ = 275000332.

The previous prime is 550000637. The next prime is 550000669. The reversal of 550000666 is 666000055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 462035025 + 87965641 = 21495^2 + 9379^2 .

550000666 is a modest number, since divided by 666 gives 550 as remainder.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (550000669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137500165 + ... + 137500168.

Almost surely, 2^550000666 is an apocalyptic number.

550000666 is a deficient number, since it is larger than the sum of its proper divisors (275000336).

550000666 is a wasteful number, since it uses less digits than its factorization.

550000666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275000335.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 550000666 is about 23452.0929982806. The cubic root of 550000666 is about 819.3216013084.

The spelling of 550000666 in words is "five hundred fifty million, six hundred sixty-six", and thus it is an aban number.