66511634353 has 4 divisors (see below), whose sum is σ = 66515948388. Its totient is φ = 66507320320.

The previous prime is 66511634297. The next prime is 66511634359. The reversal of 66511634353 is 35343611566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13863414049 + 52648220304 = 117743^2 + 229452^2 .

It is a cyclic number.

It is not a de Polignac number, because 66511634353 - 2¹⁷ = 66511503281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66511634359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133808 + ... + 2164753.

It is an arithmetic number, because the mean of its divisors is an integer number (16628987097).

Almost surely, 2^66511634353 is an apocalyptic number.

It is an amenable number.

66511634353 is a deficient number, since it is larger than the sum of its proper divisors (4314035).

66511634353 is a wasteful number, since it uses less digits than its factorization.

66511634353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314034.

The product of its digits is 583200, while the sum is 43.

The spelling of 66511634353 in words is "sixty-six billion, five hundred eleven million, six hundred thirty-four thousand, three hundred fifty-three".