71665223 has 8 divisors (see below), whose sum is σ = 81982848. Its totient is φ = 61367544.

The previous prime is 71665213. The next prime is 71665229. The reversal of 71665223 is 32256617.

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

It is not a de Polignac number, because 71665223 - 2¹⁰ = 71664199 is a prime.

It is a super-3 number, since 3×71665223³ (a number of 25 digits) contains 333 as substring.

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 71665223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71665229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3740 + ... + 12542.

It is an arithmetic number, because the mean of its divisors is an integer number (10247856).

Almost surely, 2^71665223 is an apocalyptic number.

71665223 is a deficient number, since it is larger than the sum of its proper divisors (10317625).

71665223 is a wasteful number, since it uses less digits than its factorization.

71665223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973.

The product of its digits is 15120, while the sum is 32.

The square root of 71665223 is about 8465.5314658916. The cubic root of 71665223 is about 415.3709809909.

The spelling of 71665223 in words is "seventy-one million, six hundred sixty-five thousand, two hundred twenty-three".