11129994475261 has 2 divisors, whose sum is σ = 11129994475262. Its totient is φ = 11129994475260.

The previous prime is 11129994475207. The next prime is 11129994475297. The reversal of 11129994475261 is 16257449992111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10335382687161 + 794611788100 = 3214869^2 + 891410^2 .

It is a cyclic number.

It is not a de Polignac number, because 11129994475261 - 2¹³ = 11129994467069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11129994475261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11129994475861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5564997237630 + 5564997237631.

It is an arithmetic number, because the mean of its divisors is an integer number (5564997237631).

Almost surely, 2^{11129994475261} is an apocalyptic number.

It is an amenable number.

11129994475261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11129994475261 is an equidigital number, since it uses as much as digits as its factorization.

11129994475261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 61.

The spelling of 11129994475261 in words is "eleven trillion, one hundred twenty-nine billion, nine hundred ninety-four million, four hundred seventy-five thousand, two hundred sixty-one".