520501440040 has 16 divisors (see below), whose sum is σ = 1171128240180. Its totient is φ = 208200576000.

The previous prime is 520501440031. The next prime is 520501440059. The reversal of 520501440040 is 40044105025.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 498258103876 + 22243336164 = 705874^2 + 149142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 520501439987 and 520501440014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6506267961 + ... + 6506268040.

Almost surely, 2^520501440040 is an apocalyptic number.

It is an amenable number.

520501440040 is an abundant number, since it is smaller than the sum of its proper divisors (650626800140).

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

520501440040 is a wasteful number, since it uses less digits than its factorization.

520501440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13012536012 (or 13012536008 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 520501440040 its reverse (40044105025), we get a palindrome (560545545065).

The spelling of 520501440040 in words is "five hundred twenty billion, five hundred one million, four hundred forty thousand, forty".