71816660525 has 24 divisors (see below), whose sum is σ = 91480261704. Its totient is φ = 55887840000.

The previous prime is 71816660519. The next prime is 71816660527. The reversal of 71816660525 is 52506661817.

It can be written as a sum of positive squares in 12 ways, for example, as 10537638409 + 61279022116 = 102653^2 + 247546^2 .

It is not a de Polignac number, because 71816660525 - 2²⁸ = 71548225069 is a prime.

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 71816660525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71816660527) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7858859 + ... + 7867991.

It is an arithmetic number, because the mean of its divisors is an integer number (3811677571).

Almost surely, 2^71816660525 is an apocalyptic number.

It is an amenable number.

71816660525 is a deficient number, since it is larger than the sum of its proper divisors (19663601179).

71816660525 is a wasteful number, since it uses less digits than its factorization.

71816660525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17681 (or 17676 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 71816660525 in words is "seventy-one billion, eight hundred sixteen million, six hundred sixty thousand, five hundred twenty-five".