11805456912649 has 3 divisors (see below), whose sum is σ = 11805460348557. Its totient is φ = 11805453476742.

The previous prime is 11805456912637. The next prime is 11805456912731. The reversal of 11805456912649 is 94621965450811.

The square root of 11805456912649 is 3435907.

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 11805456912649 - 2¹⁹ = 11805456388361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11805456952649) 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, 1717954 + ... + 5153860.

It is an arithmetic number, because the mean of its divisors is an integer number (3935153449519).

Almost surely, 2^{11805456912649} is an apocalyptic number.

11805456912649 is the 3435907-th square number.

11805456912649 is the 1717954-th centered octagonal number.

It is an amenable number.

11805456912649 is a deficient number, since it is larger than the sum of its proper divisors (3435908).

11805456912649 is an frugal number, since it uses more digits than its factorization.

11805456912649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6871814 (or 3435907 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 61.

The spelling of 11805456912649 in words is "eleven trillion, eight hundred five billion, four hundred fifty-six million, nine hundred twelve thousand, six hundred forty-nine".