66533544663 has 8 divisors (see below), whose sum is σ = 88730534400. Its totient is φ = 44346125688.

The previous prime is 66533544661. The next prime is 66533544689. The reversal of 66533544663 is 36644533566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66533544663 - 2¹ = 66533544661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66533544661) 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, 2376453 + ... + 2404286.

It is an arithmetic number, because the mean of its divisors is an integer number (11091316800).

Almost surely, 2^66533544663 is an apocalyptic number.

66533544663 is a deficient number, since it is larger than the sum of its proper divisors (22196989737).

66533544663 is a wasteful number, since it uses less digits than its factorization.

66533544663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785381.

The product of its digits is 13996800, while the sum is 51.

The spelling of 66533544663 in words is "sixty-six billion, five hundred thirty-three million, five hundred forty-four thousand, six hundred sixty-three".