66218452559 has 32 divisors (see below), whose sum is σ = 81154867200. Its totient is φ = 53939916576.

The previous prime is 66218452537. The next prime is 66218452577. The reversal of 66218452559 is 95525481266.

It is not a de Polignac number, because 66218452559 - 2¹⁶ = 66218387023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66218452559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66218452589) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 485042 + ... + 606384.

It is an arithmetic number, because the mean of its divisors is an integer number (2536089600).

Almost surely, 2^66218452559 is an apocalyptic number.

66218452559 is a deficient number, since it is larger than the sum of its proper divisors (14936414641).

66218452559 is a wasteful number, since it uses less digits than its factorization.

66218452559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121444 (or 121430 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 53.

The spelling of 66218452559 in words is "sixty-six billion, two hundred eighteen million, four hundred fifty-two thousand, five hundred fifty-nine".