51405988957 has 2 divisors, whose sum is σ = 51405988958. Its totient is φ = 51405988956.

The previous prime is 51405988937. The next prime is 51405988993. The reversal of 51405988957 is 75988950415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48783115161 + 2622873796 = 220869^2 + 51214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51405988957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51405988895 and 51405988904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51405988937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25702994478 + 25702994479.

It is an arithmetic number, because the mean of its divisors is an integer number (25702994479).

Almost surely, 2^51405988957 is an apocalyptic number.

It is an amenable number.

51405988957 is a deficient number, since it is larger than the sum of its proper divisors (1).

51405988957 is an equidigital number, since it uses as much as digits as its factorization.

51405988957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144000, while the sum is 61.

The spelling of 51405988957 in words is "fifty-one billion, four hundred five million, nine hundred eighty-eight thousand, nine hundred fifty-seven".