66726271 has 8 divisors (see below), whose sum is σ = 70318080. Its totient is φ = 63142488.

The previous prime is 66726269. The next prime is 66726293. The reversal of 66726271 is 17262766.

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 66726271 - 2¹ = 66726269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66726271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66726211) 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, 23490 + ... + 26176.

It is an arithmetic number, because the mean of its divisors is an integer number (8789760).

Almost surely, 2^66726271 is an apocalyptic number.

66726271 is a deficient number, since it is larger than the sum of its proper divisors (3591809).

66726271 is a wasteful number, since it uses less digits than its factorization.

66726271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013.

The product of its digits is 42336, while the sum is 37.

The square root of 66726271 is about 8168.6149988844. The cubic root of 66726271 is about 405.6009389077.

The spelling of 66726271 in words is "sixty-six million, seven hundred twenty-six thousand, two hundred seventy-one".