66212227 has 2 divisors, whose sum is σ = 66212228. Its totient is φ = 66212226.

The previous prime is 66212213. The next prime is 66212273. The reversal of 66212227 is 72221266.

66212227 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66212227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66212195 and 66212204.

It is not a weakly prime, because it can be changed into another prime (66212287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106113 + 33106114.

It is an arithmetic number, because the mean of its divisors is an integer number (33106114).

Almost surely, 2^66212227 is an apocalyptic number.

66212227 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212227 is an equidigital number, since it uses as much as digits as its factorization.

66212227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 28.

The square root of 66212227 is about 8137.0895902651. The cubic root of 66212227 is about 404.5567003442.

The spelling of 66212227 in words is "sixty-six million, two hundred twelve thousand, two hundred twenty-seven".