81474757998105 has 16 divisors (see below), whose sum is σ = 137220645049920. Its totient is φ = 41166193514688.

The previous prime is 81474757998103. The next prime is 81474757998131. The reversal of 81474757998105 is 50189975747418.

It is not a de Polignac number, because 81474757998105 - 2¹ = 81474757998103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81474757998103) 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, 142938171642 + ... + 142938172211.

It is an arithmetic number, because the mean of its divisors is an integer number (8576290315620).

Almost surely, 2^{81474757998105} is an apocalyptic number.

It is an amenable number.

81474757998105 is a deficient number, since it is larger than the sum of its proper divisors (55745887051815).

81474757998105 is a wasteful number, since it uses less digits than its factorization.

81474757998105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285876343880.

The product of its (nonzero) digits is 711244800, while the sum is 75.

The spelling of 81474757998105 in words is "eighty-one trillion, four hundred seventy-four billion, seven hundred fifty-seven million, nine hundred ninety-eight thousand, one hundred five".