66998289966 has 16 divisors (see below), whose sum is σ = 134049302784. Its totient is φ = 22323976184.

The previous prime is 66998289961. The next prime is 66998290031.

66998289966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66998289891 and 66998289900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66998289961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2180256 + ... + 2210771.

It is an arithmetic number, because the mean of its divisors is an integer number (8378081424).

Almost surely, 2^66998289966 is an apocalyptic number.

66998289966 is an abundant number, since it is smaller than the sum of its proper divisors (67051012818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66998289966 is a wasteful number, since it uses less digits than its factorization.

66998289966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4393575.

The product of its digits is 1088391168, while the sum is 78.

The spelling of 66998289966 in words is "sixty-six billion, nine hundred ninety-eight million, two hundred eighty-nine thousand, nine hundred sixty-six".