66197665333 has 4 divisors (see below), whose sum is σ = 66201734668. Its totient is φ = 66193596000.

The previous prime is 66197665207. The next prime is 66197665351. The reversal of 66197665333 is 33356679166.

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 8124859044 + 58072806289 = 90138^2 + 240983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66197665333 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 (66197665363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010168 + ... + 2042833.

It is an arithmetic number, because the mean of its divisors is an integer number (16550433667).

Almost surely, 2^66197665333 is an apocalyptic number.

It is an amenable number.

66197665333 is a deficient number, since it is larger than the sum of its proper divisors (4069335).

66197665333 is a wasteful number, since it uses less digits than its factorization.

66197665333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069334.

The product of its digits is 11022480, while the sum is 55.

The spelling of 66197665333 in words is "sixty-six billion, one hundred ninety-seven million, six hundred sixty-five thousand, three hundred thirty-three".