11919279809761 has 3 divisors (see below), whose sum is σ = 11919283262193. Its totient is φ = 11919276357330.

The previous prime is 11919279809747. The next prime is 11919279809771. The reversal of 11919279809761 is 16790897291911.

The square root of 11919279809761 is 3452431.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 11919279809761 - 2¹⁷ = 11919279678689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11919279809771) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1726216 + ... + 5178646.

It is an arithmetic number, because the mean of its divisors is an integer number (3973094420731).

Almost surely, 2^{11919279809761} is an apocalyptic number.

11919279809761 is the 3452431-st square number.

11919279809761 is the 1726216-th centered octagonal number.

It is an amenable number.

11919279809761 is a deficient number, since it is larger than the sum of its proper divisors (3452432).

11919279809761 is an frugal number, since it uses more digits than its factorization.

11919279809761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904862 (or 3452431 counting only the distinct ones).

The product of its (nonzero) digits is 30862944, while the sum is 70.

The spelling of 11919279809761 in words is "eleven trillion, nine hundred nineteen billion, two hundred seventy-nine million, eight hundred nine thousand, seven hundred sixty-one".