66531873505 has 8 divisors (see below), whose sum is σ = 79955145792. Its totient is φ = 53147567088.

The previous prime is 66531873503. The next prime is 66531873517. The reversal of 66531873505 is 50537813566.

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 66531873505 - 2¹ = 66531873503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66531873503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9737709 + ... + 9744538.

It is an arithmetic number, because the mean of its divisors is an integer number (9994393224).

Almost surely, 2^66531873505 is an apocalyptic number.

It is an amenable number.

66531873505 is a deficient number, since it is larger than the sum of its proper divisors (13423272287).

66531873505 is a wasteful number, since it uses less digits than its factorization.

66531873505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19482935.

The product of its (nonzero) digits is 2268000, while the sum is 49.

The spelling of 66531873505 in words is "sixty-six billion, five hundred thirty-one million, eight hundred seventy-three thousand, five hundred five".