71521035520 has 576 divisors, whose sum is σ = 206157643776. Its totient is φ = 23503011840.

The previous prime is 71521035499. The next prime is 71521035533. The reversal of 71521035520 is 2553012517.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 563157697 + ... + 563157823.

It is an arithmetic number, because the mean of its divisors is an integer number (357912576).

Almost surely, 2^71521035520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71521035520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103078821888).

71521035520 is an abundant number, since it is smaller than the sum of its proper divisors (134636608256).

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

71521035520 is a wasteful number, since it uses less digits than its factorization.

71521035520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The spelling of 71521035520 in words is "seventy-one billion, five hundred twenty-one million, thirty-five thousand, five hundred twenty".