6164430221 has 2 divisors, whose sum is σ = 6164430222. Its totient is φ = 6164430220.

The previous prime is 6164430187. The next prime is 6164430257. The reversal of 6164430221 is 1220344616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5498222500 + 666207721 = 74150^2 + 25811^2 .

It is a cyclic number.

It is not a de Polignac number, because 6164430221 - 2¹⁸ = 6164168077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6164439221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3082215110 + 3082215111.

It is an arithmetic number, because the mean of its divisors is an integer number (3082215111).

Almost surely, 2^6164430221 is an apocalyptic number.

It is an amenable number.

6164430221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6164430221 is an equidigital number, since it uses as much as digits as its factorization.

6164430221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 6164430221 is about 78513.8855298857. The cubic root of 6164430221 is about 1833.5706431725.

Adding to 6164430221 its reverse (1220344616), we get a palindrome (7384774837).

The spelling of 6164430221 in words is "six billion, one hundred sixty-four million, four hundred thirty thousand, two hundred twenty-one".