66686855107 has 2 divisors, whose sum is σ = 66686855108. Its totient is φ = 66686855106.

The previous prime is 66686855071. The next prime is 66686855117. The reversal of 66686855107 is 70155868666.

Together with previous prime (66686855071) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66686855107 - 2⁷ = 66686854979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66686855117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33343427553 + 33343427554.

It is an arithmetic number, because the mean of its divisors is an integer number (33343427554).

Almost surely, 2^66686855107 is an apocalyptic number.

66686855107 is a deficient number, since it is larger than the sum of its proper divisors (1).

66686855107 is an equidigital number, since it uses as much as digits as its factorization.

66686855107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14515200, while the sum is 58.

The spelling of 66686855107 in words is "sixty-six billion, six hundred eighty-six million, eight hundred fifty-five thousand, one hundred seven".