81254524512285 has 24 divisors (see below), whose sum is σ = 140844162100824. Its totient is φ = 43334827551360.

The previous prime is 81254524512241. The next prime is 81254524512307. The reversal of 81254524512285 is 58221542545218.

81254524512285 is a `hidden beast` number, since 8 + 1 + 2 + 5 + 45 + 2 + 4 + 512 + 2 + 85 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10804454462169 + 70450070050116 = 3287013^2 + 8393454^2 .

It is not a de Polignac number, because 81254524512285 - 2⁶ = 81254524512221 is a prime.

It is a congruent number.

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, 16994262 + ... + 21244151.

It is an arithmetic number, because the mean of its divisors is an integer number (5868506754201).

Almost surely, 2^{81254524512285} is an apocalyptic number.

It is an amenable number.

81254524512285 is a deficient number, since it is larger than the sum of its proper divisors (59589637588539).

81254524512285 is a wasteful number, since it uses less digits than its factorization.

81254524512285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38285645 (or 38285642 counting only the distinct ones).

The product of its digits is 10240000, while the sum is 54.

The spelling of 81254524512285 in words is "eighty-one trillion, two hundred fifty-four billion, five hundred twenty-four million, five hundred twelve thousand, two hundred eighty-five".