66868686271 has 2 divisors, whose sum is σ = 66868686272. Its totient is φ = 66868686270.

The previous prime is 66868686263. The next prime is 66868686289. The reversal of 66868686271 is 17268686866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66868686271 - 2³ = 66868686263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66868686211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33434343135 + 33434343136.

It is an arithmetic number, because the mean of its divisors is an integer number (33434343136).

Almost surely, 2^66868686271 is an apocalyptic number.

66868686271 is a deficient number, since it is larger than the sum of its proper divisors (1).

66868686271 is an equidigital number, since it uses as much as digits as its factorization.

66868686271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55738368, while the sum is 64.

The spelling of 66868686271 in words is "sixty-six billion, eight hundred sixty-eight million, six hundred eighty-six thousand, two hundred seventy-one".