66998988989966 has 32 divisors (see below), whose sum is σ = 111417266949120. Its totient is φ = 29960125588800.

The previous prime is 66998988989917. The next prime is 66998988989981.

66998988989966 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28742846 + ... + 30986273.

It is an arithmetic number, because the mean of its divisors is an integer number (3481789592160).

Almost surely, 2^{66998988989966} is an apocalyptic number.

66998988989966 is a deficient number, since it is larger than the sum of its proper divisors (44418277959154).

66998988989966 is a wasteful number, since it uses less digits than its factorization.

66998988989966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59729960.

The product of its digits is 2821109907456, while the sum is 110.

The spelling of 66998988989966 in words is "sixty-six trillion, nine hundred ninety-eight billion, nine hundred eighty-eight million, nine hundred eighty-nine thousand, nine hundred sixty-six".