520864475648 has 120 divisors (see below), whose sum is σ = 1165513503924. Its totient is φ = 232288010240.

The previous prime is 520864475597. The next prime is 520864475693. The reversal of 520864475648 is 846574468025.

It can be written as a sum of positive squares in 2 ways, for example, as 431659512064 + 89204963584 = 657008^2 + 298672^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3204140 + ... + 3362772.

Almost surely, 2^520864475648 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 520864475648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (582756751962).

520864475648 is an abundant number, since it is smaller than the sum of its proper divisors (644649028276).

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

520864475648 is a wasteful number, since it uses less digits than its factorization.

520864475648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158726 (or 158699 counting only the distinct ones).

The product of its (nonzero) digits is 51609600, while the sum is 59.

The spelling of 520864475648 in words is "five hundred twenty billion, eight hundred sixty-four million, four hundred seventy-five thousand, six hundred forty-eight".