81038532056 has 16 divisors (see below), whose sum is σ = 153654521400. Its totient is φ = 40063993024.

The previous prime is 81038532053. The next prime is 81038532059. The reversal of 81038532056 is 65023583018.

It is an interprime number because it is at equal distance from previous prime (81038532053) and next prime (81038532059).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81038532053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56908370 + ... + 56909793.

Almost surely, 2^81038532056 is an apocalyptic number.

It is an amenable number.

81038532056 is a deficient number, since it is larger than the sum of its proper divisors (72615989344).

81038532056 is a wasteful number, since it uses less digits than its factorization.

81038532056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113818258 (or 113818254 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 81038532056 in words is "eighty-one billion, thirty-eight million, five hundred thirty-two thousand, fifty-six".