520025720660 has 24 divisors (see below), whose sum is σ = 1100025216360. Its totient is φ = 206491963904.

The previous prime is 520025720653. The next prime is 520025720663. The reversal of 520025720660 is 66027520025.

It can be written as a sum of positive squares in 4 ways, for example, as 28700425744 + 491325294916 = 169412^2 + 700946^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 520025720660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520025720663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94892465 + ... + 94897944.

It is an arithmetic number, because the mean of its divisors is an integer number (45834384015).

Almost surely, 2^520025720660 is an apocalyptic number.

It is an amenable number.

520025720660 is an abundant number, since it is smaller than the sum of its proper divisors (579999495700).

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

520025720660 is a wasteful number, since it uses less digits than its factorization.

520025720660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189790555 (or 189790553 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 520025720660 in words is "five hundred twenty billion, twenty-five million, seven hundred twenty thousand, six hundred sixty".