520821745009 has 4 divisors (see below), whose sum is σ = 522662104816. Its totient is φ = 518981385204.

The previous prime is 520821745001. The next prime is 520821745057. The reversal of 520821745009 is 900547128025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520821745009 - 2³ = 520821745001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520821745001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920179479 + ... + 920180044.

It is an arithmetic number, because the mean of its divisors is an integer number (130665526204).

Almost surely, 2^520821745009 is an apocalyptic number.

It is an amenable number.

520821745009 is a deficient number, since it is larger than the sum of its proper divisors (1840359807).

520821745009 is a wasteful number, since it uses less digits than its factorization.

520821745009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840359806.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 520821745009 in words is "five hundred twenty billion, eight hundred twenty-one million, seven hundred forty-five thousand, nine".