66424602217 has 2 divisors, whose sum is σ = 66424602218. Its totient is φ = 66424602216.

The previous prime is 66424602119. The next prime is 66424602227. The reversal of 66424602217 is 71220642466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60928010896 + 5496591321 = 246836^2 + 74139^2 .

It is a cyclic number.

It is not a de Polignac number, because 66424602217 - 2¹¹ = 66424600169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66424602217.

It is not a weakly prime, because it can be changed into another prime (66424602227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33212301108 + 33212301109.

It is an arithmetic number, because the mean of its divisors is an integer number (33212301109).

Almost surely, 2^66424602217 is an apocalyptic number.

It is an amenable number.

66424602217 is a deficient number, since it is larger than the sum of its proper divisors (1).

66424602217 is an equidigital number, since it uses as much as digits as its factorization.

66424602217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 66424602217 in words is "sixty-six billion, four hundred twenty-four million, six hundred two thousand, two hundred seventeen".