66042212591 has 2 divisors, whose sum is σ = 66042212592. Its totient is φ = 66042212590.

The previous prime is 66042212563. The next prime is 66042212669. The reversal of 66042212591 is 19521224066.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66042212591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66042212521) 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, 33021106295 + 33021106296.

It is an arithmetic number, because the mean of its divisors is an integer number (33021106296).

Almost surely, 2^66042212591 is an apocalyptic number.

66042212591 is a deficient number, since it is larger than the sum of its proper divisors (1).

66042212591 is an equidigital number, since it uses as much as digits as its factorization.

66042212591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 66042212591 in words is "sixty-six billion, forty-two million, two hundred twelve thousand, five hundred ninety-one".