66727121 has 2 divisors, whose sum is σ = 66727122. Its totient is φ = 66727120.

The previous prime is 66727079. The next prime is 66727139. The reversal of 66727121 is 12172766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38254225 + 28472896 = 6185^2 + 5336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66727121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66727181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33363560 + 33363561.

It is an arithmetic number, because the mean of its divisors is an integer number (33363561).

Almost surely, 2^66727121 is an apocalyptic number.

It is an amenable number.

66727121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66727121 is an equidigital number, since it uses as much as digits as its factorization.

66727121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 66727121 is about 8168.6670271226. The cubic root of 66727121 is about 405.6026611645.

Adding to 66727121 its reverse (12172766), we get a palindrome (78899887).

The spelling of 66727121 in words is "sixty-six million, seven hundred twenty-seven thousand, one hundred twenty-one".