66643233065 has 8 divisors (see below), whose sum is σ = 80321103240. Its totient is φ = 53081770752.

The previous prime is 66643233049. The next prime is 66643233067. The reversal of 66643233065 is 56033234666.

It can be written as a sum of positive squares in 4 ways, for example, as 37546037824 + 29097195241 = 193768^2 + 170579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66643233065 - 2⁴ = 66643233049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66643233067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29100704 + ... + 29102993.

It is an arithmetic number, because the mean of its divisors is an integer number (10040137905).

Almost surely, 2^66643233065 is an apocalyptic number.

It is an amenable number.

66643233065 is a deficient number, since it is larger than the sum of its proper divisors (13677870175).

66643233065 is a wasteful number, since it uses less digits than its factorization.

66643233065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58203931.

The product of its (nonzero) digits is 1399680, while the sum is 44.

The spelling of 66643233065 in words is "sixty-six billion, six hundred forty-three million, two hundred thirty-three thousand, sixty-five".