81158442911403 has 32 divisors (see below), whose sum is σ = 133820325461760. Its totient is φ = 43013676032640.

The previous prime is 81158442911389. The next prime is 81158442911407. The reversal of 81158442911403 is 30411924485118.

It is not a de Polignac number, because 81158442911403 - 2¹⁶ = 81158442845867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81158442911407) 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 31 ways as a sum of consecutive naturals, for example, 4978426576 + ... + 4978442877.

It is an arithmetic number, because the mean of its divisors is an integer number (4181885170680).

Almost surely, 2^{81158442911403} is an apocalyptic number.

81158442911403 is a deficient number, since it is larger than the sum of its proper divisors (52661882550357).

81158442911403 is a wasteful number, since it uses less digits than its factorization.

81158442911403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9956869499.

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 81158442911403 in words is "eighty-one trillion, one hundred fifty-eight billion, four hundred forty-two million, nine hundred eleven thousand, four hundred three".