66055221216559 has 4 divisors (see below), whose sum is σ = 66056651060400. Its totient is φ = 66053791372720.

The previous prime is 66055221216557. The next prime is 66055221216581. The reversal of 66055221216559 is 95561212255066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66055221216559 - 2¹ = 66055221216557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66055221216557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714852622 + ... + 714945019.

It is an arithmetic number, because the mean of its divisors is an integer number (16514162765100).

Almost surely, 2^{66055221216559} is an apocalyptic number.

66055221216559 is a deficient number, since it is larger than the sum of its proper divisors (1429843841).

66055221216559 is a wasteful number, since it uses less digits than its factorization.

66055221216559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429843840.

The product of its (nonzero) digits is 9720000, while the sum is 55.

The spelling of 66055221216559 in words is "sixty-six trillion, fifty-five billion, two hundred twenty-one million, two hundred sixteen thousand, five hundred fifty-nine".