66620274533 has 2 divisors, whose sum is σ = 66620274534. Its totient is φ = 66620274532.

The previous prime is 66620274527. The next prime is 66620274629. The reversal of 66620274533 is 33547202666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54299718529 + 12320556004 = 233023^2 + 110998^2 .

It is a cyclic number.

It is not a de Polignac number, because 66620274533 - 2⁴ = 66620274517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66620276533) 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, 33310137266 + 33310137267.

It is an arithmetic number, because the mean of its divisors is an integer number (33310137267).

Almost surely, 2^66620274533 is an apocalyptic number.

It is an amenable number.

66620274533 is a deficient number, since it is larger than the sum of its proper divisors (1).

66620274533 is an equidigital number, since it uses as much as digits as its factorization.

66620274533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 44.

The spelling of 66620274533 in words is "sixty-six billion, six hundred twenty million, two hundred seventy-four thousand, five hundred thirty-three".