66552206417 has 2 divisors, whose sum is σ = 66552206418. Its totient is φ = 66552206416.

The previous prime is 66552206389. The next prime is 66552206419. The reversal of 66552206417 is 71460225566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55594094656 + 10958111761 = 235784^2 + 104681^2 .

It is a cyclic number.

It is not a de Polignac number, because 66552206417 - 2³⁴ = 49372337233 is a prime.

Together with 66552206419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66552206419) 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, 33276103208 + 33276103209.

It is an arithmetic number, because the mean of its divisors is an integer number (33276103209).

Almost surely, 2^66552206417 is an apocalyptic number.

It is an amenable number.

66552206417 is a deficient number, since it is larger than the sum of its proper divisors (1).

66552206417 is an equidigital number, since it uses as much as digits as its factorization.

66552206417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 66552206417 in words is "sixty-six billion, five hundred fifty-two million, two hundred six thousand, four hundred seventeen".