81006449348 has 18 divisors (see below), whose sum is σ = 155820257838. Its totient is φ = 36821113120.

The previous prime is 81006449341. The next prime is 81006449371. The reversal of 81006449348 is 84394460018.

It can be written as a sum of positive squares in only one way, i.e., 80342768704 + 663680644 = 283448^2 + 25762^2 .

It is not an unprimeable number, because it can be changed into a prime (81006449341) 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 5 ways as a sum of consecutive naturals, for example, 83683865 + ... + 83684832.

It is an arithmetic number, because the mean of its divisors is an integer number (8656680991).

Almost surely, 2^81006449348 is an apocalyptic number.

It is an amenable number.

81006449348 is a deficient number, since it is larger than the sum of its proper divisors (74813808490).

81006449348 is a wasteful number, since it uses less digits than its factorization.

81006449348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167368723 (or 167368710 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The spelling of 81006449348 in words is "eighty-one billion, six million, four hundred forty-nine thousand, three hundred forty-eight".