66320220593 has 4 divisors (see below), whose sum is σ = 72349331568. Its totient is φ = 60291109620.

The previous prime is 66320220569. The next prime is 66320220641. The reversal of 66320220593 is 39502202366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66320220593 - 2¹⁰ = 66320219569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66320250593) 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, 3014555471 + ... + 3014555492.

It is an arithmetic number, because the mean of its divisors is an integer number (18087332892).

Almost surely, 2^66320220593 is an apocalyptic number.

It is an amenable number.

66320220593 is a deficient number, since it is larger than the sum of its proper divisors (6029110975).

66320220593 is a wasteful number, since it uses less digits than its factorization.

66320220593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6029110974.

The product of its (nonzero) digits is 116640, while the sum is 38.

The spelling of 66320220593 in words is "sixty-six billion, three hundred twenty million, two hundred twenty thousand, five hundred ninety-three".