66321203543 has 8 divisors (see below), whose sum is σ = 76219102080. Its totient is φ = 56529165240.

The previous prime is 66321203519. The next prime is 66321203549. The reversal of 66321203543 is 34530212366.

66321203543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66321203543 - 2⁸ = 66321203287 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 (66321203549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26463713 + ... + 26466218.

It is an arithmetic number, because the mean of its divisors is an integer number (9527387760).

Almost surely, 2^66321203543 is an apocalyptic number.

66321203543 is a deficient number, since it is larger than the sum of its proper divisors (9897898537).

66321203543 is a wasteful number, since it uses less digits than its factorization.

66321203543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52930117.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 66321203543 in words is "sixty-six billion, three hundred twenty-one million, two hundred three thousand, five hundred forty-three".