11691257569 has 2 divisors, whose sum is σ = 11691257570. Its totient is φ = 11691257568.

The previous prime is 11691257563. The next prime is 11691257623. The reversal of 11691257569 is 96575219611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8768449600 + 2922807969 = 93640^2 + 54063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11691257569 is a prime.

It is a super-2 number, since 2×11691257569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11691257563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5845628784 + 5845628785.

It is an arithmetic number, because the mean of its divisors is an integer number (5845628785).

Almost surely, 2^11691257569 is an apocalyptic number.

It is an amenable number.

11691257569 is a deficient number, since it is larger than the sum of its proper divisors (1).

11691257569 is an equidigital number, since it uses as much as digits as its factorization.

11691257569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 52.

The spelling of 11691257569 in words is "eleven billion, six hundred ninety-one million, two hundred fifty-seven thousand, five hundred sixty-nine".