6650164421 has 2 divisors, whose sum is σ = 6650164422. Its totient is φ = 6650164420.

The previous prime is 6650164387. The next prime is 6650164459. The reversal of 6650164421 is 1244610566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6647956225 + 2208196 = 81535^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650164421 - 2⁶ = 6650164357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6650164471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325082210 + 3325082211.

It is an arithmetic number, because the mean of its divisors is an integer number (3325082211).

Almost surely, 2^6650164421 is an apocalyptic number.

It is an amenable number.

6650164421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6650164421 is an equidigital number, since it uses as much as digits as its factorization.

6650164421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 6650164421 is about 81548.5402751024. The cubic root of 6650164421 is about 1880.5178538901.

Adding to 6650164421 its reverse (1244610566), we get a palindrome (7894774987).

The spelling of 6650164421 in words is "six billion, six hundred fifty million, one hundred sixty-four thousand, four hundred twenty-one".