11959260781 has 4 divisors (see below), whose sum is σ = 12879203932. Its totient is φ = 11039317632.

The previous prime is 11959260773. The next prime is 11959260791. The reversal of 11959260781 is 18706295911.

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 8047884100 + 3911376681 = 89710^2 + 62541^2 .

It is a cyclic number.

It is not a de Polignac number, because 11959260781 - 2³ = 11959260773 is a prime.

It is a super-2 number, since 2×11959260781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11959260721) 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, 459971556 + ... + 459971581.

It is an arithmetic number, because the mean of its divisors is an integer number (3219800983).

Almost surely, 2^11959260781 is an apocalyptic number.

It is an amenable number.

11959260781 is a deficient number, since it is larger than the sum of its proper divisors (919943151).

11959260781 is an equidigital number, since it uses as much as digits as its factorization.

11959260781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919943150.

The product of its (nonzero) digits is 272160, while the sum is 49.

The spelling of 11959260781 in words is "eleven billion, nine hundred fifty-nine million, two hundred sixty thousand, seven hundred eighty-one".