71065566 has 64 divisors (see below), whose sum is σ = 185552640. Its totient is φ = 19876320.

The previous prime is 71065543. The next prime is 71065591. The reversal of 71065566 is 66556017.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 71065566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3121 + ... + 12323.

It is an arithmetic number, because the mean of its divisors is an integer number (2899260).

Almost surely, 2^71065566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71065566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92776320).

71065566 is an abundant number, since it is smaller than the sum of its proper divisors (114487074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71065566 is a wasteful number, since it uses less digits than its factorization.

71065566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9238 (or 9232 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 71065566 is about 8430.0395016868. The cubic root of 71065566 is about 414.2091990394.

It can be divided in two parts, 71065 and 566, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 71065566 in words is "seventy-one million, sixty-five thousand, five hundred sixty-six".