51438855257 has 2 divisors, whose sum is σ = 51438855258. Its totient is φ = 51438855256.

The previous prime is 51438855239. The next prime is 51438855277. The reversal of 51438855257 is 75255883415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32191177561 + 19247677696 = 179419^2 + 138736^2 .

It is a cyclic number.

It is not a de Polignac number, because 51438855257 - 2³⁰ = 50365113433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51438855199 and 51438855208.

It is not a weakly prime, because it can be changed into another prime (51438855217) 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, 25719427628 + 25719427629.

It is an arithmetic number, because the mean of its divisors is an integer number (25719427629).

Almost surely, 2^51438855257 is an apocalyptic number.

It is an amenable number.

51438855257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51438855257 is an equidigital number, since it uses as much as digits as its factorization.

51438855257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720000, while the sum is 53.

The spelling of 51438855257 in words is "fifty-one billion, four hundred thirty-eight million, eight hundred fifty-five thousand, two hundred fifty-seven".