6165056221 has 4 divisors (see below), whose sum is σ = 6165216700. Its totient is φ = 6164895744.

The previous prime is 6165056213. The next prime is 6165056299. The reversal of 6165056221 is 1226505616.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1620948121 + 4544108100 = 40261^2 + 67410^2 .

It is a cyclic number.

It is not a de Polignac number, because 6165056221 - 2³ = 6165056213 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 (6165056921) 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, 15325 + ... + 112093.

It is an arithmetic number, because the mean of its divisors is an integer number (1541304175).

Almost surely, 2^6165056221 is an apocalyptic number.

It is an amenable number.

6165056221 is a deficient number, since it is larger than the sum of its proper divisors (160479).

6165056221 is an equidigital number, since it uses as much as digits as its factorization.

6165056221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160478.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 6165056221 is about 78517.8719846635. The cubic root of 6165056221 is about 1833.6327076473.

The spelling of 6165056221 in words is "six billion, one hundred sixty-five million, fifty-six thousand, two hundred twenty-one".