81717023181548 has 24 divisors (see below), whose sum is σ = 143033972281200. Its totient is φ = 40850174776320.

The previous prime is 81717023181523. The next prime is 81717023181581. The reversal of 81717023181548 is 84518132071718.

It is a junction number, because it is equal to n+sod(n) for n = 81717023181493 and 81717023181502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448329440 + ... + 448511672.

It is an arithmetic number, because the mean of its divisors is an integer number (5959748845050).

Almost surely, 2^{81717023181548} is an apocalyptic number.

It is an amenable number.

81717023181548 is a deficient number, since it is larger than the sum of its proper divisors (61316949099652).

81717023181548 is a wasteful number, since it uses less digits than its factorization.

81717023181548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204497 (or 204495 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 56.

The spelling of 81717023181548 in words is "eighty-one trillion, seven hundred seventeen billion, twenty-three million, one hundred eighty-one thousand, five hundred forty-eight".