11720780765185 has 4 divisors (see below), whose sum is σ = 14064936918228. Its totient is φ = 9376624612144.

The previous prime is 11720780765171. The next prime is 11720780765219. The reversal of 11720780765185 is 58156708702711.

It is a happy number.

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 8663909676304 + 3056871088881 = 2943452^2 + 1748391^2 .

It is a cyclic number.

It is not a de Polignac number, because 11720780765185 - 2²¹ = 11720778668033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1172078076514 + ... + 1172078076523.

It is an arithmetic number, because the mean of its divisors is an integer number (3516234229557).

Almost surely, 2^{11720780765185} is an apocalyptic number.

It is an amenable number.

11720780765185 is a deficient number, since it is larger than the sum of its proper divisors (2344156153043).

11720780765185 is an equidigital number, since it uses as much as digits as its factorization.

11720780765185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344156153042.

The product of its (nonzero) digits is 6585600, while the sum is 58.

The spelling of 11720780765185 in words is "eleven trillion, seven hundred twenty billion, seven hundred eighty million, seven hundred sixty-five thousand, one hundred eighty-five".