11191974939557 has 2 divisors, whose sum is σ = 11191974939558. Its totient is φ = 11191974939556.

The previous prime is 11191974939521. The next prime is 11191974939601. The reversal of 11191974939557 is 75593947919111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11191607488996 + 367450561 = 3345386^2 + 19169^2 .

It is a cyclic number.

It is not a de Polignac number, because 11191974939557 - 2¹⁰ = 11191974938533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11191974939157) 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, 5595987469778 + 5595987469779.

It is an arithmetic number, because the mean of its divisors is an integer number (5595987469779).

Almost surely, 2^{11191974939557} is an apocalyptic number.

It is an amenable number.

11191974939557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11191974939557 is an equidigital number, since it uses as much as digits as its factorization.

11191974939557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96446700, while the sum is 71.

The spelling of 11191974939557 in words is "eleven trillion, one hundred ninety-one billion, nine hundred seventy-four million, nine hundred thirty-nine thousand, five hundred fifty-seven".