550065721 has 4 divisors (see below), whose sum is σ = 550483444. Its totient is φ = 549648000.

The previous prime is 550065689. The next prime is 550065727. The reversal of 550065721 is 127560055.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 414692496 + 135373225 = 20364^2 + 11635^2 .

It is a cyclic number.

It is not a de Polignac number, because 550065721 - 2⁵ = 550065689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (550065727) 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 3 ways as a sum of consecutive naturals, for example, 206880 + ... + 209521.

It is an arithmetic number, because the mean of its divisors is an integer number (137620861).

Almost surely, 2^550065721 is an apocalyptic number.

It is an amenable number.

550065721 is a deficient number, since it is larger than the sum of its proper divisors (417723).

550065721 is a wasteful number, since it uses less digits than its factorization.

550065721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417722.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 550065721 is about 23453.4799336900. The cubic root of 550065721 is about 819.3539036119.

The spelling of 550065721 in words is "five hundred fifty million, sixty-five thousand, seven hundred twenty-one".