66440604560565 has 16 divisors (see below), whose sum is σ = 106305073289856. Its totient is φ = 35434953768000.

The previous prime is 66440604560563. The next prime is 66440604560597. The reversal of 66440604560565 is 56506540604466.

66440604560565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66440604560565 - 2¹ = 66440604560563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66440604560563) 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 15 ways as a sum of consecutive naturals, for example, 21659040 + ... + 24535590.

It is an arithmetic number, because the mean of its divisors is an integer number (6644067080616).

Almost surely, 2^{66440604560565} is an apocalyptic number.

It is an amenable number.

66440604560565 is a deficient number, since it is larger than the sum of its proper divisors (39864468729291).

66440604560565 is a wasteful number, since it uses less digits than its factorization.

66440604560565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416380.

The product of its (nonzero) digits is 62208000, while the sum is 57.

The spelling of 66440604560565 in words is "sixty-six trillion, four hundred forty billion, six hundred four million, five hundred sixty thousand, five hundred sixty-five".