51438386310557 has 2 divisors, whose sum is σ = 51438386310558. Its totient is φ = 51438386310556.

The previous prime is 51438386310499. The next prime is 51438386310587. The reversal of 51438386310557 is 75501368383415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40737250865476 + 10701135445081 = 6382574^2 + 3271259^2 .

It is a cyclic number.

It is not a de Polignac number, because 51438386310557 - 2²⁰ = 51438385261981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51438386310496 and 51438386310505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51438386310587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25719193155278 + 25719193155279.

It is an arithmetic number, because the mean of its divisors is an integer number (25719193155279).

Almost surely, 2^{51438386310557} is an apocalyptic number.

It is an amenable number.

51438386310557 is a deficient number, since it is larger than the sum of its proper divisors (1).

51438386310557 is an equidigital number, since it uses as much as digits as its factorization.

51438386310557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288000, while the sum is 59.

The spelling of 51438386310557 in words is "fifty-one trillion, four hundred thirty-eight billion, three hundred eighty-six million, three hundred ten thousand, five hundred fifty-seven".