66700033370221 has 2 divisors, whose sum is σ = 66700033370222. Its totient is φ = 66700033370220.

The previous prime is 66700033370141. The next prime is 66700033370417. The reversal of 66700033370221 is 12207333000766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34718904675625 + 31981128694596 = 5892275^2 + 5655186^2 .

It is a cyclic number.

It is not a de Polignac number, because 66700033370221 - 2⁷ = 66700033370093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66700033370921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33350016685110 + 33350016685111.

It is an arithmetic number, because the mean of its divisors is an integer number (33350016685111).

Almost surely, 2^{66700033370221} is an apocalyptic number.

It is an amenable number.

66700033370221 is a deficient number, since it is larger than the sum of its proper divisors (1).

66700033370221 is an equidigital number, since it uses as much as digits as its factorization.

66700033370221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 40.

Adding to 66700033370221 its reverse (12207333000766), we get a palindrome (78907366370987).

The spelling of 66700033370221 in words is "sixty-six trillion, seven hundred billion, thirty-three million, three hundred seventy thousand, two hundred twenty-one".