549945345889 has 9 divisors (see below), whose sum is σ = 552046812499. Its totient is φ = 547851857080.

The previous prime is 549945345883. The next prime is 549945345913. The reversal of 549945345889 is 988543549945.

The square root of 549945345889 is 741583.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 520324182225 + 29621163664 = 721335^2 + 172108^2 .

It is not a de Polignac number, because 549945345889 - 2³ = 549945345881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549945345881) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 217282554 + ... + 217285084.

Almost surely, 2^549945345889 is an apocalyptic number.

549945345889 is the 741583-rd square number.

549945345889 is the 370792-nd centered octagonal number.

It is an amenable number.

549945345889 is a deficient number, since it is larger than the sum of its proper divisors (2101466610).

549945345889 is an frugal number, since it uses more digits than its factorization.

549945345889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5648 (or 2824 counting only the distinct ones).

The product of its digits is 1119744000, while the sum is 73.

The spelling of 549945345889 in words is "five hundred forty-nine billion, nine hundred forty-five million, three hundred forty-five thousand, eight hundred eighty-nine".