71665265 has 16 divisors (see below), whose sum is σ = 98444160. Its totient is φ = 49061760.

The previous prime is 71665261. The next prime is 71665303. The reversal of 71665265 is 56256617.

It is not a de Polignac number, because 71665265 - 2² = 71665261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71665261) 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 15 ways as a sum of consecutive naturals, for example, 27050 + ... + 29580.

It is an arithmetic number, because the mean of its divisors is an integer number (6152760).

Almost surely, 2^71665265 is an apocalyptic number.

It is an amenable number.

71665265 is a deficient number, since it is larger than the sum of its proper divisors (26778895).

71665265 is a wasteful number, since it uses less digits than its factorization.

71665265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352.

The product of its digits is 75600, while the sum is 38.

The square root of 71665265 is about 8465.5339465388. The cubic root of 71665265 is about 415.3710621347.

The spelling of 71665265 in words is "seventy-one million, six hundred sixty-five thousand, two hundred sixty-five".