66566552389 has 2 divisors, whose sum is σ = 66566552390. Its totient is φ = 66566552388.

The previous prime is 66566552387. The next prime is 66566552419. The reversal of 66566552389 is 98325566566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65463316164 + 1103236225 = 255858^2 + 33215^2 .

It is a cyclic number.

It is not a de Polignac number, because 66566552389 - 2¹ = 66566552387 is a prime.

It is a super-2 number, since 2×66566552389² (a number of 22 digits) contains 22 as substring.

Together with 66566552387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66566552387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283276194 + 33283276195.

It is an arithmetic number, because the mean of its divisors is an integer number (33283276195).

Almost surely, 2^66566552389 is an apocalyptic number.

It is an amenable number.

66566552389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566552389 is an equidigital number, since it uses as much as digits as its factorization.

66566552389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984000, while the sum is 61.

The spelling of 66566552389 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-two thousand, three hundred eighty-nine".