66564203323 has 4 divisors (see below), whose sum is σ = 66564745480. Its totient is φ = 66563661168.

The previous prime is 66564203309. The next prime is 66564203339. The reversal of 66564203323 is 32330246566.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66564203323 - 2⁹ = 66564202811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66564200323) 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, 10768 + ... + 365026.

It is an arithmetic number, because the mean of its divisors is an integer number (16641186370).

Almost surely, 2^66564203323 is an apocalyptic number.

66564203323 is a deficient number, since it is larger than the sum of its proper divisors (542157).

66564203323 is a wasteful number, since it uses less digits than its factorization.

66564203323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542156.

The product of its (nonzero) digits is 466560, while the sum is 40.

Adding to 66564203323 its reverse (32330246566), we get a palindrome (98894449889).

The spelling of 66564203323 in words is "sixty-six billion, five hundred sixty-four million, two hundred three thousand, three hundred twenty-three".