81448340047 has 8 divisors (see below), whose sum is σ = 82054081296. Its totient is φ = 80842761792.

The previous prime is 81448340011. The next prime is 81448340063. The reversal of 81448340047 is 74004384418.

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 81448340047 - 2⁷ = 81448339919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81448339985 and 81448340012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81448340087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1075408 + ... + 1148650.

It is an arithmetic number, because the mean of its divisors is an integer number (10256760162).

Almost surely, 2^81448340047 is an apocalyptic number.

81448340047 is a deficient number, since it is larger than the sum of its proper divisors (605741249).

81448340047 is a wasteful number, since it uses less digits than its factorization.

81448340047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81497.

The product of its (nonzero) digits is 344064, while the sum is 43.

The spelling of 81448340047 in words is "eighty-one billion, four hundred forty-eight million, three hundred forty thousand, forty-seven".