51871044720457 has 2 divisors, whose sum is σ = 51871044720458. Its totient is φ = 51871044720456.

The previous prime is 51871044720431. The next prime is 51871044720511. The reversal of 51871044720457 is 75402744017815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28027590103881 + 23843454616576 = 5294109^2 + 4882976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51871044720457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51871044720398 and 51871044720407.

It is not a weakly prime, because it can be changed into another prime (51871044720857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25935522360228 + 25935522360229.

It is an arithmetic number, because the mean of its divisors is an integer number (25935522360229).

Almost surely, 2^{51871044720457} is an apocalyptic number.

It is an amenable number.

51871044720457 is a deficient number, since it is larger than the sum of its proper divisors (1).

51871044720457 is an equidigital number, since it uses as much as digits as its factorization.

51871044720457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8780800, while the sum is 55.

The spelling of 51871044720457 in words is "fifty-one trillion, eight hundred seventy-one billion, forty-four million, seven hundred twenty thousand, four hundred fifty-seven".