531085458473865 has 24 divisors (see below), whose sum is σ = 924567988860360. Its totient is φ = 282008697594624.

The previous prime is 531085458473827. The next prime is 531085458473893. The reversal of 531085458473865 is 568374854580135.

531085458473865 is a `hidden beast` number, since 5 + 3 + 1 + 0 + 8 + 5 + 4 + 584 + 7 + 38 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 360388724984649 + 170696733489216 = 18983907^2 + 13065096^2 .

It is not a de Polignac number, because 531085458473865 - 2⁷ = 531085458473737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 531085458473793 and 531085458473802.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25768328292 + ... + 25768348901.

It is an arithmetic number, because the mean of its divisors is an integer number (38523666202515).

Almost surely, 2^{531085458473865} is an apocalyptic number.

It is an amenable number.

531085458473865 is a deficient number, since it is larger than the sum of its proper divisors (393482530386495).

531085458473865 is a wasteful number, since it uses less digits than its factorization.

531085458473865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51536677433 (or 51536677430 counting only the distinct ones).

The product of its (nonzero) digits is 1935360000, while the sum is 72.

The spelling of 531085458473865 in words is "five hundred thirty-one trillion, eighty-five billion, four hundred fifty-eight million, four hundred seventy-three thousand, eight hundred sixty-five".