66172353447 has 8 divisors (see below), whose sum is σ = 88234265344. Its totient is φ = 44112671928.

The previous prime is 66172353437. The next prime is 66172353449. The reversal of 66172353447 is 74435327166.

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

It is not a de Polignac number, because 66172353447 - 2¹⁶ = 66172287911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66172353396 and 66172353405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66172353449) 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, 487093 + ... + 607950.

It is an arithmetic number, because the mean of its divisors is an integer number (11029283168).

Almost surely, 2^66172353447 is an apocalyptic number.

66172353447 is a deficient number, since it is larger than the sum of its proper divisors (22061911897).

66172353447 is a wasteful number, since it uses less digits than its factorization.

66172353447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115189.

The product of its digits is 2540160, while the sum is 48.

The spelling of 66172353447 in words is "sixty-six billion, one hundred seventy-two million, three hundred fifty-three thousand, four hundred forty-seven".