66044610520391 has 2 divisors, whose sum is σ = 66044610520392. Its totient is φ = 66044610520390.

The previous prime is 66044610520387. The next prime is 66044610520409. The reversal of 66044610520391 is 19302501644066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66044610520391 - 2² = 66044610520387 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66044610580391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33022305260195 + 33022305260196.

It is an arithmetic number, because the mean of its divisors is an integer number (33022305260196).

Almost surely, 2^{66044610520391} is an apocalyptic number.

66044610520391 is a deficient number, since it is larger than the sum of its proper divisors (1).

66044610520391 is an equidigital number, since it uses as much as digits as its factorization.

66044610520391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 66044610520391 in words is "sixty-six trillion, forty-four billion, six hundred ten million, five hundred twenty thousand, three hundred ninety-one".