66312301557169 has 2 divisors, whose sum is σ = 66312301557170. Its totient is φ = 66312301557168.

The previous prime is 66312301557167. The next prime is 66312301557193. The reversal of 66312301557169 is 96175510321366.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34020529274944 + 32291772282225 = 5832712^2 + 5682585^2 .

It is a cyclic number.

It is not a de Polignac number, because 66312301557169 - 2¹ = 66312301557167 is a prime.

It is a super-2 number, since 2×66312301557169² (a number of 28 digits) contains 22 as substring.

Together with 66312301557167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66312301557167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33156150778584 + 33156150778585.

It is an arithmetic number, because the mean of its divisors is an integer number (33156150778585).

Almost surely, 2^{66312301557169} is an apocalyptic number.

It is an amenable number.

66312301557169 is a deficient number, since it is larger than the sum of its proper divisors (1).

66312301557169 is an equidigital number, since it uses as much as digits as its factorization.

66312301557169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6123600, while the sum is 55.

The spelling of 66312301557169 in words is "sixty-six trillion, three hundred twelve billion, three hundred one million, five hundred fifty-seven thousand, one hundred sixty-nine".