66116655313 has 2 divisors, whose sum is σ = 66116655314. Its totient is φ = 66116655312.

The previous prime is 66116655299. The next prime is 66116655331. The reversal of 66116655313 is 31355661166.

66116655313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (66116655331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61200822544 + 4915832769 = 247388^2 + 70113^2 .

It is a cyclic number.

It is not a de Polignac number, because 66116655313 - 2⁵ = 66116655281 is a prime.

It is a super-2 number, since 2×66116655313² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66116655313.

It is not a weakly prime, because it can be changed into another prime (66416655313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33058327656 + 33058327657.

It is an arithmetic number, because the mean of its divisors is an integer number (33058327657).

Almost surely, 2^66116655313 is an apocalyptic number.

It is an amenable number.

66116655313 is a deficient number, since it is larger than the sum of its proper divisors (1).

66116655313 is an equidigital number, since it uses as much as digits as its factorization.

66116655313 is an evil number, because the sum of its binary digits is even.

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

The spelling of 66116655313 in words is "sixty-six billion, one hundred sixteen million, six hundred fifty-five thousand, three hundred thirteen".