11555945281 has 2 divisors, whose sum is σ = 11555945282. Its totient is φ = 11555945280.

The previous prime is 11555945257. The next prime is 11555945311. The reversal of 11555945281 is 18254955511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7310250000 + 4245695281 = 85500^2 + 65159^2 .

It is a cyclic number.

It is not a de Polignac number, because 11555945281 - 2⁵ = 11555945249 is a prime.

It is a super-2 number, since 2×11555945281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11555945231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777972640 + 5777972641.

It is an arithmetic number, because the mean of its divisors is an integer number (5777972641).

Almost surely, 2^11555945281 is an apocalyptic number.

It is an amenable number.

11555945281 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555945281 is an equidigital number, since it uses as much as digits as its factorization.

11555945281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360000, while the sum is 46.

The spelling of 11555945281 in words is "eleven billion, five hundred fifty-five million, nine hundred forty-five thousand, two hundred eighty-one".