81448041663 has 6 divisors (see below), whose sum is σ = 117647171304. Its totient is φ = 54298694436.

The previous prime is 81448041643. The next prime is 81448041667. The reversal of 81448041663 is 36614084418.

81448041663 is a `hidden beast` number, since 8 + 1 + 4 + 480 + 4 + 166 + 3 = 666.

It is not a de Polignac number, because 81448041663 - 2⁸ = 81448041407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81448041667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4524891195 + ... + 4524891212.

It is an arithmetic number, because the mean of its divisors is an integer number (19607861884).

Almost surely, 2^81448041663 is an apocalyptic number.

81448041663 is a deficient number, since it is larger than the sum of its proper divisors (36199129641).

81448041663 is a wasteful number, since it uses less digits than its factorization.

81448041663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9049782413 (or 9049782410 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 81448041663 in words is "eighty-one billion, four hundred forty-eight million, forty-one thousand, six hundred sixty-three".