71545565 has 16 divisors (see below), whose sum is σ = 105667968. Its totient is φ = 45285696.

The previous prime is 71545553. The next prime is 71545567. The reversal of 71545565 is 56554517.

It is a cyclic number.

It is not a de Polignac number, because 71545565 - 2¹² = 71541469 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71545567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78167 + ... + 79076.

It is an arithmetic number, because the mean of its divisors is an integer number (6604248).

Almost surely, 2^71545565 is an apocalyptic number.

It is an amenable number.

71545565 is a deficient number, since it is larger than the sum of its proper divisors (34122403).

71545565 is a wasteful number, since it uses less digits than its factorization.

71545565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157268.

The product of its digits is 105000, while the sum is 38.

The square root of 71545565 is about 8458.4611484596. The cubic root of 71545565 is about 415.1396733131.

The spelling of 71545565 in words is "seventy-one million, five hundred forty-five thousand, five hundred sixty-five".