11281205557 has 2 divisors, whose sum is σ = 11281205558. Its totient is φ = 11281205556.

The previous prime is 11281205497. The next prime is 11281205653. The reversal of 11281205557 is 75550218211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8296659396 + 2984546161 = 91086^2 + 54631^2 .

It is a cyclic number.

It is not a de Polignac number, because 11281205557 - 2¹¹ = 11281203509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11281208557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5640602778 + 5640602779.

It is an arithmetic number, because the mean of its divisors is an integer number (5640602779).

Almost surely, 2^11281205557 is an apocalyptic number.

It is an amenable number.

11281205557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11281205557 is an equidigital number, since it uses as much as digits as its factorization.

11281205557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28000, while the sum is 37.

The spelling of 11281205557 in words is "eleven billion, two hundred eighty-one million, two hundred five thousand, five hundred fifty-seven".