520454331540 has 144 divisors (see below), whose sum is σ = 1854710073216. Its totient is φ = 116465299200.

The previous prime is 520454331539. The next prime is 520454331557. The reversal of 520454331540 is 45133454025.

520454331540 is a `hidden beast` number, since 5 + 2 + 0 + 45 + 43 + 31 + 540 = 666.

It is a super-2 number, since 2×520454331540² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 520454331495 and 520454331504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10084096 + ... + 10135575.

It is an arithmetic number, because the mean of its divisors is an integer number (12879931064).

Almost surely, 2^520454331540 is an apocalyptic number.

It is an amenable number.

520454331540 is an abundant number, since it is smaller than the sum of its proper divisors (1334255741676).

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

520454331540 is a wasteful number, since it uses less digits than its factorization.

520454331540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20219710 (or 20219705 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 520454331540 its reverse (45133454025), we get a palindrome (565587785565).

The spelling of 520454331540 in words is "five hundred twenty billion, four hundred fifty-four million, three hundred thirty-one thousand, five hundred forty".