66357566719 has 2 divisors, whose sum is σ = 66357566720. Its totient is φ = 66357566718.

The previous prime is 66357566707. The next prime is 66357566749. The reversal of 66357566719 is 91766575366.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66357566719 - 2⁷ = 66357566591 is a prime.

It is a super-2 number, since 2×66357566719² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66357566749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33178783359 + 33178783360.

It is an arithmetic number, because the mean of its divisors is an integer number (33178783360).

Almost surely, 2^66357566719 is an apocalyptic number.

66357566719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66357566719 is an equidigital number, since it uses as much as digits as its factorization.

66357566719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42865200, while the sum is 61.

The spelling of 66357566719 in words is "sixty-six billion, three hundred fifty-seven million, five hundred sixty-six thousand, seven hundred nineteen".