11661241299791 has 2 divisors, whose sum is σ = 11661241299792. Its totient is φ = 11661241299790.

The previous prime is 11661241299779. The next prime is 11661241299793. The reversal of 11661241299791 is 19799214216611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11661241299791 - 2²⁶ = 11661174190927 is a prime.

It is a super-2 number, since 2×11661241299791² (a number of 27 digits) contains 22 as substring.

Together with 11661241299793, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11661241299791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11661241299793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830620649895 + 5830620649896.

It is an arithmetic number, because the mean of its divisors is an integer number (5830620649896).

Almost surely, 2^{11661241299791} is an apocalyptic number.

11661241299791 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661241299791 is an equidigital number, since it uses as much as digits as its factorization.

11661241299791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 59.

The spelling of 11661241299791 in words is "eleven trillion, six hundred sixty-one billion, two hundred forty-one million, two hundred ninety-nine thousand, seven hundred ninety-one".