5478173391857 has 2 divisors, whose sum is σ = 5478173391858. Its totient is φ = 5478173391856.

The previous prime is 5478173391827. The next prime is 5478173391947. The reversal of 5478173391857 is 7581933718745.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5477865354256 + 308037601 = 2340484^2 + 17551^2 .

It is a cyclic number.

It is not a de Polignac number, because 5478173391857 - 2¹⁸ = 5478173129713 is a prime.

It is a super-2 number, since 2×5478173391857² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5478173391827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2739086695928 + 2739086695929.

It is an arithmetic number, because the mean of its divisors is an integer number (2739086695929).

Almost surely, 2^{5478173391857} is an apocalyptic number.

It is an amenable number.

5478173391857 is a deficient number, since it is larger than the sum of its proper divisors (1).

5478173391857 is an equidigital number, since it uses as much as digits as its factorization.

5478173391857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 177811200, while the sum is 68.

The spelling of 5478173391857 in words is "five trillion, four hundred seventy-eight billion, one hundred seventy-three million, three hundred ninety-one thousand, eight hundred fifty-seven".