81583432147 has 6 divisors (see below), whose sum is σ = 94903176228. Its totient is φ = 69928656084.

The previous prime is 81583432129. The next prime is 81583432187. The reversal of 81583432147 is 74123438518.

It is not a de Polignac number, because 81583432147 - 2³⁵ = 47223693779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81583432097 and 81583432106.

It is not an unprimeable number, because it can be changed into a prime (81583432187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 832483953 + ... + 832484050.

It is an arithmetic number, because the mean of its divisors is an integer number (15817196038).

Almost surely, 2^81583432147 is an apocalyptic number.

81583432147 is a deficient number, since it is larger than the sum of its proper divisors (13319744081).

81583432147 is a wasteful number, since it uses less digits than its factorization.

81583432147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664968017 (or 1664968010 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The spelling of 81583432147 in words is "eighty-one billion, five hundred eighty-three million, four hundred thirty-two thousand, one hundred forty-seven".