520365649866851 has 2 divisors, whose sum is σ = 520365649866852. Its totient is φ = 520365649866850.

The previous prime is 520365649866817. The next prime is 520365649866943. The reversal of 520365649866851 is 158668946563025.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520365649866851 is a prime.

It is a super-2 number, since 2×520365649866851² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (520365649869851) by changing a digit.

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 as a sum of consecutive naturals, namely, 260182824933425 + 260182824933426.

It is an arithmetic number, because the mean of its divisors is an integer number (260182824933426).

Almost surely, 2^{520365649866851} is an apocalyptic number.

520365649866851 is a deficient number, since it is larger than the sum of its proper divisors (1).

520365649866851 is an equidigital number, since it uses as much as digits as its factorization.

520365649866851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488000, while the sum is 74.

The spelling of 520365649866851 in words is "five hundred twenty trillion, three hundred sixty-five billion, six hundred forty-nine million, eight hundred sixty-six thousand, eight hundred fifty-one".