66242534165 has 16 divisors (see below), whose sum is σ = 81525524976. Its totient is φ = 51640742400.

The previous prime is 66242534161. The next prime is 66242534179. The reversal of 66242534165 is 56143524266.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 28467113284 + 37775420881 = 168722^2 + 194359^2 .

It is not a de Polignac number, because 66242534165 - 2² = 66242534161 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 (66242534161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14546 + ... + 364275.

It is an arithmetic number, because the mean of its divisors is an integer number (5095345311).

Almost surely, 2^66242534165 is an apocalyptic number.

It is an amenable number.

66242534165 is a deficient number, since it is larger than the sum of its proper divisors (15282990811).

66242534165 is a wasteful number, since it uses less digits than its factorization.

66242534165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379720.

The product of its digits is 1036800, while the sum is 44.

The spelling of 66242534165 in words is "sixty-six billion, two hundred forty-two million, five hundred thirty-four thousand, one hundred sixty-five".