520666025857 has 2 divisors, whose sum is σ = 520666025858. Its totient is φ = 520666025856.

The previous prime is 520666025837. The next prime is 520666025903. The reversal of 520666025857 is 758520666025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274936630336 + 245729395521 = 524344^2 + 495711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520666025857 is a prime.

It is a super-2 number, since 2×520666025857² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (520666025827) 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 as a sum of consecutive naturals, namely, 260333012928 + 260333012929.

It is an arithmetic number, because the mean of its divisors is an integer number (260333012929).

Almost surely, 2^520666025857 is an apocalyptic number.

It is an amenable number.

520666025857 is a deficient number, since it is larger than the sum of its proper divisors (1).

520666025857 is an equidigital number, since it uses as much as digits as its factorization.

520666025857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048000, while the sum is 52.

The spelling of 520666025857 in words is "five hundred twenty billion, six hundred sixty-six million, twenty-five thousand, eight hundred fifty-seven".