521380973568 has 1056 divisors, whose sum is σ = 1887026131200. Its totient is φ = 126414618624.

The previous prime is 521380973567. The next prime is 521380973579. The reversal of 521380973568 is 865379083125.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (521380973567) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1375675203 + ... + 1375675581.

Almost surely, 2^521380973568 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 521380973568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943513065600).

521380973568 is an abundant number, since it is smaller than the sum of its proper divisors (1365645157632).

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

521380973568 is a wasteful number, since it uses less digits than its factorization.

521380973568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 57.

The spelling of 521380973568 in words is "five hundred twenty-one billion, three hundred eighty million, nine hundred seventy-three thousand, five hundred sixty-eight".