81105601438 has 8 divisors (see below), whose sum is σ = 121705364160. Its totient is φ = 40537146720.

The previous prime is 81105601399. The next prime is 81105601439. The reversal of 81105601438 is 83410650118.

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

It is a junction number, because it is equal to n+sod(n) for n = 81105601397 and 81105601406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81105601439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7820523 + ... + 7830886.

It is an arithmetic number, because the mean of its divisors is an integer number (15213170520).

Almost surely, 2^81105601438 is an apocalyptic number.

81105601438 is a deficient number, since it is larger than the sum of its proper divisors (40599762722).

81105601438 is a wasteful number, since it uses less digits than its factorization.

81105601438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15654002.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 81105601438 in words is "eighty-one billion, one hundred five million, six hundred one thousand, four hundred thirty-eight".