81080001888005 has 32 divisors (see below), whose sum is σ = 103209860966400. Its totient is φ = 60935564777472.

The previous prime is 81080001887977. The next prime is 81080001888013. The reversal of 81080001888005 is 50088810008018.

It is a cyclic number.

It is not a de Polignac number, because 81080001888005 - 2⁴⁴ = 63487815843589 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 567878816 + ... + 568021574.

It is an arithmetic number, because the mean of its divisors is an integer number (3225308155200).

Almost surely, 2^{81080001888005} is an apocalyptic number.

81080001888005 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81080001888005 is a deficient number, since it is larger than the sum of its proper divisors (22129859078395).

81080001888005 is a wasteful number, since it uses less digits than its factorization.

81080001888005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155093.

The product of its (nonzero) digits is 163840, while the sum is 47.

The spelling of 81080001888005 in words is "eighty-one trillion, eighty billion, one million, eight hundred eighty-eight thousand, five".