11447362561 has 4 divisors (see below), whose sum is σ = 11447675092. Its totient is φ = 11447050032.

The previous prime is 11447362547. The next prime is 11447362571. The reversal of 11447362561 is 16526374411.

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 431600625 + 11015761936 = 20775^2 + 104956^2 .

It is a cyclic number.

It is not a de Polignac number, because 11447362561 - 2⁹ = 11447362049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11447362571) 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, 92706 + ... + 177451.

It is an arithmetic number, because the mean of its divisors is an integer number (2861918773).

Almost surely, 2^11447362561 is an apocalyptic number.

It is an amenable number.

11447362561 is a deficient number, since it is larger than the sum of its proper divisors (312531).

11447362561 is an equidigital number, since it uses as much as digits as its factorization.

11447362561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312530.

The product of its digits is 120960, while the sum is 40.

The spelling of 11447362561 in words is "eleven billion, four hundred forty-seven million, three hundred sixty-two thousand, five hundred sixty-one".