51520475329 has 2 divisors, whose sum is σ = 51520475330. Its totient is φ = 51520475328.

The previous prime is 51520475317. The next prime is 51520475399. The reversal of 51520475329 is 92357402515.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26887800625 + 24632674704 = 163975^2 + 156948^2 .

It is a cyclic number.

It is not a de Polignac number, because 51520475329 - 2¹³ = 51520467137 is a prime.

It is not a weakly prime, because it can be changed into another prime (51520475399) 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, 25760237664 + 25760237665.

It is an arithmetic number, because the mean of its divisors is an integer number (25760237665).

Almost surely, 2^51520475329 is an apocalyptic number.

It is an amenable number.

51520475329 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520475329 is an equidigital number, since it uses as much as digits as its factorization.

51520475329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 51520475329 in words is "fifty-one billion, five hundred twenty million, four hundred seventy-five thousand, three hundred twenty-nine".