81453855982041 has 9 divisors (see below), whose sum is σ = 117655608860959. Its totient is φ = 54302552604336.

The previous prime is 81453855981989. The next prime is 81453855982043. The reversal of 81453855982041 is 14028955835418.

The square root of 81453855982041 is 9025179.

It is a perfect power (a square), and thus also a powerful number.

81453855982041 is a `hidden beast` number, since 8 + 1 + 4 + 5 + 38 + 5 + 598 + 2 + 0 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7206406025625 + 74247449956416 = 2684475^2 + 8616696^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 81453855982041 - 2³³ = 81445266047449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81453855982041.

It is not an unprimeable number, because it can be changed into a prime (81453855982043) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25571341 + ... + 28579733.

Almost surely, 2^{81453855982041} is an apocalyptic number.

81453855982041 is the 9025179-th square number.

81453855982041 is the 4512590-th centered octagonal number.

It is an amenable number.

81453855982041 is a deficient number, since it is larger than the sum of its proper divisors (36201752878918).

81453855982041 is an frugal number, since it uses more digits than its factorization.

81453855982041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016792 (or 3008396 counting only the distinct ones).

The product of its (nonzero) digits is 55296000, while the sum is 63.

The spelling of 81453855982041 in words is "eighty-one trillion, four hundred fifty-three billion, eight hundred fifty-five million, nine hundred eighty-two thousand, forty-one".