66443540163 has 128 divisors (see below), whose sum is σ = 126241597440. Its totient is φ = 29916241920.

The previous prime is 66443540161. The next prime is 66443540237. The reversal of 66443540163 is 36104534466.

It is not a de Polignac number, because 66443540163 - 2¹ = 66443540161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66443540161) 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 127 ways as a sum of consecutive naturals, for example, 25983681 + ... + 25986237.

It is an arithmetic number, because the mean of its divisors is an integer number (986262480).

Almost surely, 2^66443540163 is an apocalyptic number.

66443540163 is a deficient number, since it is larger than the sum of its proper divisors (59798057277).

66443540163 is a wasteful number, since it uses less digits than its factorization.

66443540163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117.

The product of its (nonzero) digits is 622080, while the sum is 42.

It can be divided in two parts, 66443 and 540163, that added together give a palindrome (606606).

The spelling of 66443540163 in words is "sixty-six billion, four hundred forty-three million, five hundred forty thousand, one hundred sixty-three".