520864421287 has 16 divisors (see below), whose sum is σ = 601257759232. Its totient is φ = 441970071840.

The previous prime is 520864421249. The next prime is 520864421299. The reversal of 520864421287 is 782124468025.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520864421287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520864421287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520864425287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2020513 + ... + 2263669.

It is an arithmetic number, because the mean of its divisors is an integer number (37578609952).

Almost surely, 2^520864421287 is an apocalyptic number.

520864421287 is a deficient number, since it is larger than the sum of its proper divisors (80393337945).

520864421287 is a wasteful number, since it uses less digits than its factorization.

520864421287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246238.

The product of its (nonzero) digits is 1720320, while the sum is 49.

The spelling of 520864421287 in words is "five hundred twenty billion, eight hundred sixty-four million, four hundred twenty-one thousand, two hundred eighty-seven".