66722746587853 has 2 divisors, whose sum is σ = 66722746587854. Its totient is φ = 66722746587852.

The previous prime is 66722746587821. The next prime is 66722746587907. The reversal of 66722746587853 is 35878564722766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39878555612809 + 26844190975044 = 6314947^2 + 5181138^2 .

It is a cyclic number.

It is not a de Polignac number, because 66722746587853 - 2⁵ = 66722746587821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66722746587853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66722746581853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33361373293926 + 33361373293927.

It is an arithmetic number, because the mean of its divisors is an integer number (33361373293927).

Almost surely, 2^{66722746587853} is an apocalyptic number.

It is an amenable number.

66722746587853 is a deficient number, since it is larger than the sum of its proper divisors (1).

66722746587853 is an equidigital number, since it uses as much as digits as its factorization.

66722746587853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5689958400, while the sum is 76.

The spelling of 66722746587853 in words is "sixty-six trillion, seven hundred twenty-two billion, seven hundred forty-six million, five hundred eighty-seven thousand, eight hundred fifty-three".