71665525 has 12 divisors (see below), whose sum is σ = 91930500. Its totient is φ = 55354880.

The previous prime is 71665507. The next prime is 71665537. The reversal of 71665525 is 52556617.

It can be written as a sum of positive squares in 6 ways, for example, as 3090564 + 68574961 = 1758^2 + 8281^2 .

It is not a de Polignac number, because 71665525 - 2¹¹ = 71663477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48700 + ... + 50149.

It is an arithmetic number, because the mean of its divisors is an integer number (7660875).

Almost surely, 2^71665525 is an apocalyptic number.

It is an amenable number.

71665525 is a deficient number, since it is larger than the sum of its proper divisors (20264975).

71665525 is a wasteful number, since it uses less digits than its factorization.

71665525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98888 (or 98883 counting only the distinct ones).

The product of its digits is 63000, while the sum is 37.

The square root of 71665525 is about 8465.5493029100. The cubic root of 71665525 is about 415.3715644531.

The spelling of 71665525 in words is "seventy-one million, six hundred sixty-five thousand, five hundred twenty-five".