66559985280798 has 16 divisors (see below), whose sum is σ = 140126284801920. Its totient is φ = 21018942720216.

The previous prime is 66559985280769. The next prime is 66559985280809. The reversal of 66559985280798 is 89708258995566.

It is a happy number.

66559985280798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291929759890 + ... + 291929760117.

It is an arithmetic number, because the mean of its divisors is an integer number (8757892800120).

Almost surely, 2^{66559985280798} is an apocalyptic number.

66559985280798 is an abundant number, since it is smaller than the sum of its proper divisors (73566299521122).

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

66559985280798 is a wasteful number, since it uses less digits than its factorization.

66559985280798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583859520031.

The product of its (nonzero) digits is 23514624000, while the sum is 87.

The spelling of 66559985280798 in words is "sixty-six trillion, five hundred fifty-nine billion, nine hundred eighty-five million, two hundred eighty thousand, seven hundred ninety-eight".