66430121 has 2 divisors, whose sum is σ = 66430122. Its totient is φ = 66430120.

The previous prime is 66430103. The next prime is 66430163. The reversal of 66430121 is 12103466.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 1466521 = 8060^2 + 1211^2 .

It is a cyclic number.

It is not a de Polignac number, because 66430121 - 2⁶ = 66430057 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66430171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33215060 + 33215061.

It is an arithmetic number, because the mean of its divisors is an integer number (33215061).

Almost surely, 2^66430121 is an apocalyptic number.

It is an amenable number.

66430121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66430121 is an equidigital number, since it uses as much as digits as its factorization.

66430121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 66430121 is about 8150.4675326020. The cubic root of 66430121 is about 404.9999918712. Note that the first 5 decimals are identical.

Adding to 66430121 its reverse (12103466), we get a palindrome (78533587).

The spelling of 66430121 in words is "sixty-six million, four hundred thirty thousand, one hundred twenty-one".