66505236563 has 8 divisors (see below), whose sum is σ = 70419572640. Its totient is φ = 62591152000.

The previous prime is 66505236559. The next prime is 66505236601. The reversal of 66505236563 is 36563250566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66505236563 - 2² = 66505236559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66505236503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925898 + ... + 995136.

It is an arithmetic number, because the mean of its divisors is an integer number (8802446580).

Almost surely, 2^66505236563 is an apocalyptic number.

66505236563 is a deficient number, since it is larger than the sum of its proper divisors (3914336077).

66505236563 is a wasteful number, since it uses less digits than its factorization.

66505236563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125757.

The product of its (nonzero) digits is 2916000, while the sum is 47.

The spelling of 66505236563 in words is "sixty-six billion, five hundred five million, two hundred thirty-six thousand, five hundred sixty-three".