11261664121 has 2 divisors, whose sum is σ = 11261664122. Its totient is φ = 11261664120.

The previous prime is 11261664119. The next prime is 11261664191. The reversal of 11261664121 is 12146616211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10519374096 + 742290025 = 102564^2 + 27245^2 .

It is a cyclic number.

It is not a de Polignac number, because 11261664121 - 2¹ = 11261664119 is a prime.

Together with 11261664119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11261664101) 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, 5630832060 + 5630832061.

It is an arithmetic number, because the mean of its divisors is an integer number (5630832061).

Almost surely, 2^11261664121 is an apocalyptic number.

It is an amenable number.

11261664121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11261664121 is an equidigital number, since it uses as much as digits as its factorization.

11261664121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The spelling of 11261664121 in words is "eleven billion, two hundred sixty-one million, six hundred sixty-four thousand, one hundred twenty-one".