81449058144547 has 16 divisors (see below), whose sum is σ = 85499501294592. Its totient is φ = 77442429620160.

The previous prime is 81449058144539. The next prime is 81449058144577. The reversal of 81449058144547 is 74544185094418.

It is a cyclic number.

It is not a de Polignac number, because 81449058144547 - 2³ = 81449058144539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81449058144527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13123954 + ... + 18306727.

It is an arithmetic number, because the mean of its divisors is an integer number (5343718830912).

Almost surely, 2^{81449058144547} is an apocalyptic number.

81449058144547 is a deficient number, since it is larger than the sum of its proper divisors (4050443150045).

81449058144547 is a wasteful number, since it uses less digits than its factorization.

81449058144547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31431378.

The product of its (nonzero) digits is 103219200, while the sum is 64.

The spelling of 81449058144547 in words is "eighty-one trillion, four hundred forty-nine billion, fifty-eight million, one hundred forty-four thousand, five hundred forty-seven".