549564866 has 4 divisors (see below), whose sum is σ = 824347302. Its totient is φ = 274782432.

The previous prime is 549564863. The next prime is 549564871. The reversal of 549564866 is 668465945.

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., 366531025 + 183033841 = 19145^2 + 13529^2 .

It is not an unprimeable number, because it can be changed into a prime (549564863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137391215 + ... + 137391218.

Almost surely, 2^549564866 is an apocalyptic number.

549564866 is a deficient number, since it is larger than the sum of its proper divisors (274782436).

549564866 is a wasteful number, since it uses less digits than its factorization.

549564866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274782435.

The product of its digits is 6220800, while the sum is 53.

The square root of 549564866 is about 23442.7998754415. The cubic root of 549564866 is about 819.1051441750.

The spelling of 549564866 in words is "five hundred forty-nine million, five hundred sixty-four thousand, eight hundred sixty-six".