66786698089 has 2 divisors, whose sum is σ = 66786698090. Its totient is φ = 66786698088.

The previous prime is 66786698059. The next prime is 66786698141. The reversal of 66786698089 is 98089668766.

66786698089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66749889600 + 36808489 = 258360^2 + 6067^2 .

It is a cyclic number.

It is not a de Polignac number, because 66786698089 - 2⁹ = 66786697577 is a prime.

It is not a weakly prime, because it can be changed into another prime (66786698009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33393349044 + 33393349045.

It is an arithmetic number, because the mean of its divisors is an integer number (33393349045).

Almost surely, 2^66786698089 is an apocalyptic number.

It is an amenable number.

66786698089 is a deficient number, since it is larger than the sum of its proper divisors (1).

66786698089 is an equidigital number, since it uses as much as digits as its factorization.

66786698089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376233984, while the sum is 73.

The spelling of 66786698089 in words is "sixty-six billion, seven hundred eighty-six million, six hundred ninety-eight thousand, eighty-nine".