66864489911 has 2 divisors, whose sum is σ = 66864489912. Its totient is φ = 66864489910.

The previous prime is 66864489907. The next prime is 66864489917. The reversal of 66864489911 is 11998446866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66864489911 - 2² = 66864489907 is a prime.

It is a super-2 number, since 2×66864489911² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66864489917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33432244955 + 33432244956.

It is an arithmetic number, because the mean of its divisors is an integer number (33432244956).

Almost surely, 2^66864489911 is an apocalyptic number.

66864489911 is a deficient number, since it is larger than the sum of its proper divisors (1).

66864489911 is an equidigital number, since it uses as much as digits as its factorization.

66864489911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17915904, while the sum is 62.

The spelling of 66864489911 in words is "sixty-six billion, eight hundred sixty-four million, four hundred eighty-nine thousand, nine hundred eleven".