66597665011 has 2 divisors, whose sum is σ = 66597665012. Its totient is φ = 66597665010.

The previous prime is 66597665009. The next prime is 66597665027. The reversal of 66597665011 is 11056679566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66597665011 - 2¹ = 66597665009 is a prime.

Together with 66597665009, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66597665011.

It is not a weakly prime, because it can be changed into another prime (66597665051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33298832505 + 33298832506.

It is an arithmetic number, because the mean of its divisors is an integer number (33298832506).

Almost surely, 2^66597665011 is an apocalyptic number.

66597665011 is a deficient number, since it is larger than the sum of its proper divisors (1).

66597665011 is an equidigital number, since it uses as much as digits as its factorization.

66597665011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The spelling of 66597665011 in words is "sixty-six billion, five hundred ninety-seven million, six hundred sixty-five thousand, eleven".