521713473070440 has 256 divisors, whose sum is σ = 1847011868835840. Its totient is φ = 115365875328000.

The previous prime is 521713473070417. The next prime is 521713473070487. The reversal of 521713473070440 is 44070374317125.

It is a self number, because there is not a number n which added to its sum of digits gives 521713473070440.

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, 79954330 + ... + 86232950.

It is an arithmetic number, because the mean of its divisors is an integer number (7214890112640).

Almost surely, 2^{521713473070440} 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 521713473070440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923505934417920).

521713473070440 is an abundant number, since it is smaller than the sum of its proper divisors (1325298395765400).

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

521713473070440 is a wasteful number, since it uses less digits than its factorization.

521713473070440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6281864 (or 6281860 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 48.

The spelling of 521713473070440 in words is "five hundred twenty-one trillion, seven hundred thirteen billion, four hundred seventy-three million, seventy thousand, four hundred forty".