11561416409 has 2 divisors, whose sum is σ = 11561416410. Its totient is φ = 11561416408.

The previous prime is 11561416379. The next prime is 11561416411. The reversal of 11561416409 is 90461416511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11430817225 + 130599184 = 106915^2 + 11428^2 .

It is a cyclic number.

It is not a de Polignac number, because 11561416409 - 2¹⁶ = 11561350873 is a prime.

Together with 11561416411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11561416499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780708204 + 5780708205.

It is an arithmetic number, because the mean of its divisors is an integer number (5780708205).

Almost surely, 2^11561416409 is an apocalyptic number.

It is an amenable number.

11561416409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561416409 is an equidigital number, since it uses as much as digits as its factorization.

11561416409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 11561416409 in words is "eleven billion, five hundred sixty-one million, four hundred sixteen thousand, four hundred nine".