11561251601111 has 2 divisors, whose sum is σ = 11561251601112. Its totient is φ = 11561251601110.

The previous prime is 11561251601057. The next prime is 11561251601113. The reversal of 11561251601111 is 11110615216511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11561251601111 is a prime.

It is a super-2 number, since 2×11561251601111² (a number of 27 digits) contains 22 as substring.

Together with 11561251601113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11561251601113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780625800555 + 5780625800556.

It is an arithmetic number, because the mean of its divisors is an integer number (5780625800556).

Almost surely, 2^{11561251601111} is an apocalyptic number.

11561251601111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561251601111 is an equidigital number, since it uses as much as digits as its factorization.

11561251601111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 32.

Adding to 11561251601111 its reverse (11110615216511), we get a palindrome (22671866817622).

The spelling of 11561251601111 in words is "eleven trillion, five hundred sixty-one billion, two hundred fifty-one million, six hundred one thousand, one hundred eleven".