11001111010261 has 2 divisors, whose sum is σ = 11001111010262. Its totient is φ = 11001111010260.

The previous prime is 11001111010147. The next prime is 11001111010271. The reversal of 11001111010261 is 16201011110011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10160194500036 + 840916510225 = 3187506^2 + 917015^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001111010261 - 2¹¹ = 11001111008213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11001111010271) 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, 5500555505130 + 5500555505131.

It is an arithmetic number, because the mean of its divisors is an integer number (5500555505131).

Almost surely, 2^{11001111010261} is an apocalyptic number.

It is an amenable number.

11001111010261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001111010261 is an equidigital number, since it uses as much as digits as its factorization.

11001111010261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 11001111010261 its reverse (16201011110011), we get a palindrome (27202122120272).

The spelling of 11001111010261 in words is "eleven trillion, one billion, one hundred eleven million, ten thousand, two hundred sixty-one".