51521553529 has 2 divisors, whose sum is σ = 51521553530. Its totient is φ = 51521553528.

The previous prime is 51521553469. The next prime is 51521553533. The reversal of 51521553529 is 92535512515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43172528400 + 8349025129 = 207780^2 + 91373^2 .

It is a cyclic number.

It is not a de Polignac number, because 51521553529 - 2⁷ = 51521553401 is a prime.

It is a super-2 number, since 2×51521553529² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51521553539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760776764 + 25760776765.

It is an arithmetic number, because the mean of its divisors is an integer number (25760776765).

Almost surely, 2^51521553529 is an apocalyptic number.

It is an amenable number.

51521553529 is a deficient number, since it is larger than the sum of its proper divisors (1).

51521553529 is an equidigital number, since it uses as much as digits as its factorization.

51521553529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 337500, while the sum is 43.

The spelling of 51521553529 in words is "fifty-one billion, five hundred twenty-one million, five hundred fifty-three thousand, five hundred twenty-nine".