549999966 has 32 divisors (see below), whose sum is σ = 1153709568. Its totient is φ = 174463520.

The previous prime is 549999959. The next prime is 550000001. The reversal of 549999966 is 669999945.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 54 and 9999966 contains 549999966 itself.

It is a junction number, because it is equal to n+sod(n) for n = 549999897 and 549999906.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 17071 + ... + 37301.

It is an arithmetic number, because the mean of its divisors is an integer number (36053424).

Almost surely, 2^549999966 is an apocalyptic number.

549999966 is an abundant number, since it is smaller than the sum of its proper divisors (603709602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549999966 is a wasteful number, since it uses less digits than its factorization.

549999966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20456.

The product of its digits is 42515280, while the sum is 66.

The square root of 549999966 is about 23452.0780742347. The cubic root of 549999966 is about 819.3212537177.

The spelling of 549999966 in words is "five hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred sixty-six".