81535044383 has 8 divisors (see below), whose sum is σ = 87831706368. Its totient is φ = 75241916064.

The previous prime is 81535044361. The next prime is 81535044403. The reversal of 81535044383 is 38344053518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81535044383 - 2¹² = 81535040287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81535044323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835391 + ... + 927872.

It is an arithmetic number, because the mean of its divisors is an integer number (10978963296).

Almost surely, 2^81535044383 is an apocalyptic number.

81535044383 is a deficient number, since it is larger than the sum of its proper divisors (6296661985).

81535044383 is a wasteful number, since it uses less digits than its factorization.

81535044383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766833.

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 81535044383 in words is "eighty-one billion, five hundred thirty-five million, forty-four thousand, three hundred eighty-three".