65666666666659 has 2 divisors, whose sum is σ = 65666666666660. Its totient is φ = 65666666666658.

The previous prime is 65666666666651. The next prime is 65666666666669. The reversal of 65666666666659 is 95666666666656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65666666666659 - 2³ = 65666666666651 is a prime.

It is a super-2 number, since 2×65666666666659² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65666666666651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32833333333329 + 32833333333330.

It is an arithmetic number, because the mean of its divisors is an integer number (32833333333330).

Almost surely, 2^{65666666666659} is an apocalyptic number.

65666666666659 is a deficient number, since it is larger than the sum of its proper divisors (1).

65666666666659 is an equidigital number, since it uses as much as digits as its factorization.

65666666666659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81629337600, while the sum is 85.

It can be divided in two parts, 6 and 5666666666659, that added together give a palindrome (5666666666665).

The spelling of 65666666666659 in words is "sixty-five trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-nine".