66830721323 has 4 divisors (see below), whose sum is σ = 66864188880. Its totient is φ = 66797253768.

The previous prime is 66830721257. The next prime is 66830721337. The reversal of 66830721323 is 32312703866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66830721323 - 2¹⁴ = 66830704939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66830721343) 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, 16730783 + ... + 16734776.

It is an arithmetic number, because the mean of its divisors is an integer number (16716047220).

Almost surely, 2^66830721323 is an apocalyptic number.

66830721323 is a deficient number, since it is larger than the sum of its proper divisors (33467557).

66830721323 is a wasteful number, since it uses less digits than its factorization.

66830721323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33467556.

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 66830721323 in words is "sixty-six billion, eight hundred thirty million, seven hundred twenty-one thousand, three hundred twenty-three".