550606666 has 4 divisors (see below), whose sum is σ = 825910002. Its totient is φ = 275303332.

The previous prime is 550606631. The next prime is 550606741. The reversal of 550606666 is 666606055.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666606055 = 5 ⋅133321211.

It can be written as a sum of positive squares in only one way, i.e., 550606225 + 441 = 23465^2 + 21^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137651665 + ... + 137651668.

Almost surely, 2^550606666 is an apocalyptic number.

550606666 is a deficient number, since it is larger than the sum of its proper divisors (275303336).

550606666 is a wasteful number, since it uses less digits than its factorization.

550606666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275303335.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 550606666 is about 23465.0093969723. The cubic root of 550606666 is about 819.6224049732.

The spelling of 550606666 in words is "five hundred fifty million, six hundred six thousand, six hundred sixty-six".