11981053765 has 8 divisors (see below), whose sum is σ = 14873032440. Its totient is φ = 9254331072.

The previous prime is 11981053759. The next prime is 11981053769. The reversal of 11981053765 is 56735018911.

It is a Cunningham number, because it is equal to 109458²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 11981053764 = 1^2 + 109458^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11981053765 - 2¹¹ = 11981051717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981053769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41313834 + ... + 41314123.

It is an arithmetic number, because the mean of its divisors is an integer number (1859129055).

Almost surely, 2^11981053765 is an apocalyptic number.

It is an amenable number.

11981053765 is a deficient number, since it is larger than the sum of its proper divisors (2891978675).

11981053765 is an equidigital number, since it uses as much as digits as its factorization.

11981053765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82627991.

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 11981053765 in words is "eleven billion, nine hundred eighty-one million, fifty-three thousand, seven hundred sixty-five".