520328551649 has 2 divisors, whose sum is σ = 520328551650. Its totient is φ = 520328551648.

The previous prime is 520328551619. The next prime is 520328551651. The reversal of 520328551649 is 946155823025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 517042969249 + 3285582400 = 719057^2 + 57320^2 .

It is a cyclic number.

It is not a de Polignac number, because 520328551649 - 2¹² = 520328547553 is a prime.

It is a super-2 number, since 2×520328551649² (a number of 24 digits) contains 22 as substring.

Together with 520328551651, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 520328551597 and 520328551606.

It is not a weakly prime, because it can be changed into another prime (520328551619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260164275824 + 260164275825.

It is an arithmetic number, because the mean of its divisors is an integer number (260164275825).

Almost surely, 2^520328551649 is an apocalyptic number.

It is an amenable number.

520328551649 is a deficient number, since it is larger than the sum of its proper divisors (1).

520328551649 is an equidigital number, since it uses as much as digits as its factorization.

520328551649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 520328551649 in words is "five hundred twenty billion, three hundred twenty-eight million, five hundred fifty-one thousand, six hundred forty-nine".