66135566113 has 2 divisors, whose sum is σ = 66135566114. Its totient is φ = 66135566112.

The previous prime is 66135566093. The next prime is 66135566209. The reversal of 66135566113 is 31166553166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42153017344 + 23982548769 = 205312^2 + 154863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66135566113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66135566113.

It is not a weakly prime, because it can be changed into another prime (66135566513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33067783056 + 33067783057.

It is an arithmetic number, because the mean of its divisors is an integer number (33067783057).

Almost surely, 2^66135566113 is an apocalyptic number.

It is an amenable number.

66135566113 is a deficient number, since it is larger than the sum of its proper divisors (1).

66135566113 is an equidigital number, since it uses as much as digits as its factorization.

66135566113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 43.

The spelling of 66135566113 in words is "sixty-six billion, one hundred thirty-five million, five hundred sixty-six thousand, one hundred thirteen".