66224071 has 2 divisors, whose sum is σ = 66224072. Its totient is φ = 66224070.

The previous prime is 66224057. The next prime is 66224077. The reversal of 66224071 is 17042266.

66224071 = T₆₆₄₃ + T₆₆₄₄ + T₆₆₄₅.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66224071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66224077) 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, 33112035 + 33112036.

It is an arithmetic number, because the mean of its divisors is an integer number (33112036).

Almost surely, 2^66224071 is an apocalyptic number.

66224071 is the 6645-th centered triangular number.

66224071 is a deficient number, since it is larger than the sum of its proper divisors (1).

66224071 is an equidigital number, since it uses as much as digits as its factorization.

66224071 is an odious number, because the sum of its binary digits is odd.

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

The square root of 66224071 is about 8137.8173363624. The cubic root of 66224071 is about 404.5808211857.

The spelling of 66224071 in words is "sixty-six million, two hundred twenty-four thousand, seventy-one".