66321424663 has 8 divisors (see below), whose sum is σ = 71425439568. Its totient is φ = 61217747904.

The previous prime is 66321424661. The next prime is 66321424679. The reversal of 66321424663 is 36642412366.

It is a happy number.

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 66321424663 - 2¹ = 66321424661 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 (66321424661) 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, 446331 + ... + 576067.

It is an arithmetic number, because the mean of its divisors is an integer number (8928179946).

Almost surely, 2^66321424663 is an apocalyptic number.

66321424663 is a deficient number, since it is larger than the sum of its proper divisors (5104014905).

66321424663 is a wasteful number, since it uses less digits than its factorization.

66321424663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169073.

The product of its digits is 746496, while the sum is 43.

The spelling of 66321424663 in words is "sixty-six billion, three hundred twenty-one million, four hundred twenty-four thousand, six hundred sixty-three".