521025855856 has 160 divisors (see below), whose sum is σ = 1149624562176. Its totient is φ = 226654848000.

The previous prime is 521025855827. The next prime is 521025855859. The reversal of 521025855856 is 658558520125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521025855859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 250131391 + ... + 250133473.

Almost surely, 2^521025855856 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 521025855856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (574812281088).

521025855856 is an abundant number, since it is smaller than the sum of its proper divisors (628598706320).

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

521025855856 is a wasteful number, since it uses less digits than its factorization.

521025855856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751 (or 2745 counting only the distinct ones).

The product of its (nonzero) digits is 4800000, while the sum is 52.

The spelling of 521025855856 in words is "five hundred twenty-one billion, twenty-five million, eight hundred fifty-five thousand, eight hundred fifty-six".