51170975857 has 2 divisors, whose sum is σ = 51170975858. Its totient is φ = 51170975856.

The previous prime is 51170975831. The next prime is 51170975887. The reversal of 51170975857 is 75857907115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31635602496 + 19535373361 = 177864^2 + 139769^2 .

It is a cyclic number.

It is not a de Polignac number, because 51170975857 - 2²³ = 51162587249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51170975798 and 51170975807.

It is not a weakly prime, because it can be changed into another prime (51170975887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25585487928 + 25585487929.

It is an arithmetic number, because the mean of its divisors is an integer number (25585487929).

Almost surely, 2^51170975857 is an apocalyptic number.

It is an amenable number.

51170975857 is a deficient number, since it is larger than the sum of its proper divisors (1).

51170975857 is an equidigital number, since it uses as much as digits as its factorization.

51170975857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3087000, while the sum is 55.

The spelling of 51170975857 in words is "fifty-one billion, one hundred seventy million, nine hundred seventy-five thousand, eight hundred fifty-seven".