11391684774649 has 9 divisors (see below), whose sum is σ = 11420232182541. Its totient is φ = 11363208575040.

The previous prime is 11391684774641. The next prime is 11391684774653. The reversal of 11391684774649 is 94647748619311.

The square root of 11391684774649 is 3375157.

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

11391684774649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4042532466025 + 7349152308624 = 2010605^2 + 2710932^2 .

It is not a de Polignac number, because 11391684774649 - 2³ = 11391684774641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11391684774641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1420937089 + ... + 1420945105.

It is an arithmetic number, because the mean of its divisors is an integer number (1268914686949).

Almost surely, 2^{11391684774649} is an apocalyptic number.

11391684774649 is the 3375157-th square number.

11391684774649 is the 1687579-th centered octagonal number.

It is an amenable number.

11391684774649 is a deficient number, since it is larger than the sum of its proper divisors (28547407892).

11391684774649 is an frugal number, since it uses more digits than its factorization.

11391684774649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16876 (or 8438 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 70.

The spelling of 11391684774649 in words is "eleven trillion, three hundred ninety-one billion, six hundred eighty-four million, seven hundred seventy-four thousand, six hundred forty-nine".