11543201561 has 2 divisors, whose sum is σ = 11543201562. Its totient is φ = 11543201560.

The previous prime is 11543201543. The next prime is 11543201573. The reversal of 11543201561 is 16510234511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11097358336 + 445843225 = 105344^2 + 21115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11543201561 is a prime.

It is not a weakly prime, because it can be changed into another prime (11543207561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5771600780 + 5771600781.

It is an arithmetic number, because the mean of its divisors is an integer number (5771600781).

Almost surely, 2^11543201561 is an apocalyptic number.

It is an amenable number.

11543201561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11543201561 is an equidigital number, since it uses as much as digits as its factorization.

11543201561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 11543201561 in words is "eleven billion, five hundred forty-three million, two hundred one thousand, five hundred sixty-one".