66027121 has 2 divisors, whose sum is σ = 66027122. Its totient is φ = 66027120.

The previous prime is 66027107. The next prime is 66027131. The reversal of 66027121 is 12172066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34386496 + 31640625 = 5864^2 + 5625^2 .

It is a cyclic number.

It is not a de Polignac number, because 66027121 - 2¹¹ = 66025073 is a prime.

It is not a weakly prime, because it can be changed into another prime (66027131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33013560 + 33013561.

It is an arithmetic number, because the mean of its divisors is an integer number (33013561).

Almost surely, 2^66027121 is an apocalyptic number.

It is an amenable number.

66027121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66027121 is an equidigital number, since it uses as much as digits as its factorization.

66027121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 66027121 is about 8125.7074153578. The cubic root of 66027121 is about 404.1793492649.

Adding to 66027121 its reverse (12172066), we get a palindrome (78199187).

The spelling of 66027121 in words is "sixty-six million, twenty-seven thousand, one hundred twenty-one".