1338156817805 has 18 divisors (see below), whose sum is σ = 1663162798986. Its totient is φ = 1033552842336.

The previous prime is 1338156817783. The next prime is 1338156817841. The reversal of 1338156817805 is 5087186518331.

It can be written as a sum of positive squares in 3 ways, for example, as 154023281764 + 1184133536041 = 392458^2 + 1088179^2 .

It is not a de Polignac number, because 1338156817805 - 2⁶ = 1338156817741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 75004076 + ... + 75021914.

It is an arithmetic number, because the mean of its divisors is an integer number (92397933277).

Almost surely, 2^{1338156817805} is an apocalyptic number.

It is an amenable number.

1338156817805 is a deficient number, since it is larger than the sum of its proper divisors (325005981181).

1338156817805 is an frugal number, since it uses more digits than its factorization.

1338156817805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35741 (or 17873 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 1338156817805 in words is "one trillion, three hundred thirty-eight billion, one hundred fifty-six million, eight hundred seventeen thousand, eight hundred five".