81681174487683 has 16 divisors (see below), whose sum is σ = 121020998659200. Its totient is φ = 54448783253640.

The previous prime is 81681174487673. The next prime is 81681174487721. The reversal of 81681174487683 is 38678447118618.

81681174487683 is a `hidden beast` number, since 8 + 1 + 6 + 8 + 11 + 74 + 487 + 68 + 3 = 666.

It is not a de Polignac number, because 81681174487683 - 2¹³ = 81681174479491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81681174487673) 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, 147860073 + ... + 148411466.

It is an arithmetic number, because the mean of its divisors is an integer number (7563812416200).

Almost surely, 2^{81681174487683} is an apocalyptic number.

81681174487683 is a deficient number, since it is larger than the sum of its proper divisors (39339824171517).

81681174487683 is a wasteful number, since it uses less digits than its factorization.

81681174487683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296281759 (or 296281753 counting only the distinct ones).

The product of its digits is 346816512, while the sum is 72.

The spelling of 81681174487683 in words is "eighty-one trillion, six hundred eighty-one billion, one hundred seventy-four million, four hundred eighty-seven thousand, six hundred eighty-three".