66100016022565 has 32 divisors (see below), whose sum is σ = 91497009770496. Its totient is φ = 44903325788160.

The previous prime is 66100016022539. The next prime is 66100016022569. The reversal of 66100016022565 is 56522061000166.

66100016022565 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 66100016022565 - 2¹⁷ = 66100015891493 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 (66100016022569) 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, 4390449 + ... + 12307561.

It is an arithmetic number, because the mean of its divisors is an integer number (2859281555328).

Almost surely, 2^{66100016022565} is an apocalyptic number.

It is an amenable number.

66100016022565 is a deficient number, since it is larger than the sum of its proper divisors (25396993747931).

66100016022565 is a wasteful number, since it uses less digits than its factorization.

66100016022565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7919349.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 66100016022565 in words is "sixty-six trillion, one hundred billion, sixteen million, twenty-two thousand, five hundred sixty-five".