11803778958817 has 4 divisors (see below), whose sum is σ = 12122800011796. Its totient is φ = 11484757905840.

The previous prime is 11803778958781. The next prime is 11803778958899. The reversal of 11803778958817 is 71885987730811.

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 8026291291041 + 3777487667776 = 2833071^2 + 1943576^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11803778958817 is a prime.

It is a super-2 number, since 2×11803778958817² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11803778958817.

It is not an unprimeable number, because it can be changed into a prime (11803778953817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159510526434 + ... + 159510526507.

It is an arithmetic number, because the mean of its divisors is an integer number (3030700002949).

Almost surely, 2^{11803778958817} is an apocalyptic number.

It is an amenable number.

11803778958817 is a deficient number, since it is larger than the sum of its proper divisors (319021052979).

11803778958817 is an equidigital number, since it uses as much as digits as its factorization.

11803778958817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319021052978.

The product of its (nonzero) digits is 189665280, while the sum is 73.

The spelling of 11803778958817 in words is "eleven trillion, eight hundred three billion, seven hundred seventy-eight million, nine hundred fifty-eight thousand, eight hundred seventeen".