549889388721 has 6 divisors (see below), whose sum is σ = 794284672610. Its totient is φ = 366592925808.

The previous prime is 549889388689. The next prime is 549889388743. The reversal of 549889388721 is 127883988945.

549889388721 is a `hidden beast` number, since 5 + 498 + 8 + 9 + 38 + 87 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 519783321600 + 30106067121 = 720960^2 + 173511^2 .

It is not a de Polignac number, because 549889388721 - 2⁵ = 549889388689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 549889388721.

It is not an unprimeable number, because it can be changed into a prime (549889388821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30549410476 + ... + 30549410493.

Almost surely, 2^549889388721 is an apocalyptic number.

It is an amenable number.

549889388721 is a deficient number, since it is larger than the sum of its proper divisors (244395283889).

549889388721 is a wasteful number, since it uses less digits than its factorization.

549889388721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61098820975 (or 61098820972 counting only the distinct ones).

The product of its digits is 278691840, while the sum is 72.

The spelling of 549889388721 in words is "five hundred forty-nine billion, eight hundred eighty-nine million, three hundred eighty-eight thousand, seven hundred twenty-one".