66220069 has 2 divisors, whose sum is σ = 66220070. Its totient is φ = 66220068.

The previous prime is 66220031. The next prime is 66220081. The reversal of 66220069 is 96002266.

66220069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52751169 + 13468900 = 7263^2 + 3670^2 .

It is a cyclic number.

It is not a de Polignac number, because 66220069 - 2¹⁹ = 65695781 is a prime.

It is a super-2 number, since 2×66220069² = 8770195076729522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66220069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66220169) 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, 33110034 + 33110035.

It is an arithmetic number, because the mean of its divisors is an integer number (33110035).

Almost surely, 2^66220069 is an apocalyptic number.

It is an amenable number.

66220069 is a deficient number, since it is larger than the sum of its proper divisors (1).

66220069 is an equidigital number, since it uses as much as digits as its factorization.

66220069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66220069 is about 8137.5714436188. The cubic root of 66220069 is about 404.5726712535.

The spelling of 66220069 in words is "sixty-six million, two hundred twenty thousand, sixty-nine".