66868086851 has 2 divisors, whose sum is σ = 66868086852. Its totient is φ = 66868086850.

The previous prime is 66868086839. The next prime is 66868086869. The reversal of 66868086851 is 15868086866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66868086851 - 2⁶ = 66868086787 is a prime.

It is a super-2 number, since 2×66868086851² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66868086811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33434043425 + 33434043426.

It is an arithmetic number, because the mean of its divisors is an integer number (33434043426).

Almost surely, 2^66868086851 is an apocalyptic number.

66868086851 is a deficient number, since it is larger than the sum of its proper divisors (1).

66868086851 is an equidigital number, since it uses as much as digits as its factorization.

66868086851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26542080, while the sum is 62.

The spelling of 66868086851 in words is "sixty-six billion, eight hundred sixty-eight million, eighty-six thousand, eight hundred fifty-one".