11344671781 has 4 divisors (see below), whose sum is σ = 11347039564. Its totient is φ = 11342304000.

The previous prime is 11344671773. The next prime is 11344671797. The reversal of 11344671781 is 18717644311.

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 5165296900 + 6179374881 = 71870^2 + 78609^2 .

It is a cyclic number.

It is not a de Polignac number, because 11344671781 - 2³ = 11344671773 is a prime.

It is a super-2 number, since 2×11344671781² (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 (11344671721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1176690 + ... + 1186291.

It is an arithmetic number, because the mean of its divisors is an integer number (2836759891).

Almost surely, 2^11344671781 is an apocalyptic number.

It is an amenable number.

11344671781 is a deficient number, since it is larger than the sum of its proper divisors (2367783).

11344671781 is an equidigital number, since it uses as much as digits as its factorization.

11344671781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367782.

The product of its digits is 112896, while the sum is 43.

The spelling of 11344671781 in words is "eleven billion, three hundred forty-four million, six hundred seventy-one thousand, seven hundred eighty-one".