550064221 has 4 divisors (see below), whose sum is σ = 628644832. Its totient is φ = 471483612.

The previous prime is 550064173. The next prime is 550064227. The reversal of 550064221 is 122460055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 550064221 - 2²⁵ = 516509789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550064227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39290295 + ... + 39290308.

It is an arithmetic number, because the mean of its divisors is an integer number (157161208).

Almost surely, 2^550064221 is an apocalyptic number.

It is an amenable number.

550064221 is a deficient number, since it is larger than the sum of its proper divisors (78580611).

550064221 is an equidigital number, since it uses as much as digits as its factorization.

550064221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78580610.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 550064221 is about 23453.4479554713. The cubic root of 550064221 is about 819.3531588331.

The spelling of 550064221 in words is "five hundred fifty million, sixty-four thousand, two hundred twenty-one".