100805518045817 has 4 divisors (see below), whose sum is σ = 108559788664740. Its totient is φ = 93051247426896.

The previous prime is 100805518045763. The next prime is 100805518045823. The reversal of 100805518045817 is 718540815508001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18831616090681 + 81973901955136 = 4339541^2 + 9053944^2 .

It is a cyclic number.

It is not a de Polignac number, because 100805518045817 - 2¹² = 100805518041721 is a prime.

It is a super-2 number, since 2×100805518045817² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100805518045867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3877135309442 + ... + 3877135309467.

It is an arithmetic number, because the mean of its divisors is an integer number (27139947166185).

Almost surely, 2^{100805518045817} is an apocalyptic number.

It is an amenable number.

100805518045817 is a deficient number, since it is larger than the sum of its proper divisors (7754270618923).

100805518045817 is an equidigital number, since it uses as much as digits as its factorization.

100805518045817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7754270618922.

The product of its (nonzero) digits is 1792000, while the sum is 53.

The spelling of 100805518045817 in words is "one hundred trillion, eight hundred five billion, five hundred eighteen million, forty-five thousand, eight hundred seventeen".