81447104746 has 8 divisors (see below), whose sum is σ = 139623608160. Its totient is φ = 34905902028.

The previous prime is 81447104723. The next prime is 81447104803. The reversal of 81447104746 is 64740174418.

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 = 81447104696 and 81447104705.

It is an unprimeable number.

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, 2908825156 + ... + 2908825183.

It is an arithmetic number, because the mean of its divisors is an integer number (17452951020).

Almost surely, 2^81447104746 is an apocalyptic number.

81447104746 is a deficient number, since it is larger than the sum of its proper divisors (58176503414).

81447104746 is a wasteful number, since it uses less digits than its factorization.

81447104746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5817650348.

The product of its (nonzero) digits is 602112, while the sum is 46.

The spelling of 81447104746 in words is "eighty-one billion, four hundred forty-seven million, one hundred four thousand, seven hundred forty-six".