11550520655881 has 2 divisors, whose sum is σ = 11550520655882. Its totient is φ = 11550520655880.

The previous prime is 11550520655833. The next prime is 11550520655899. The reversal of 11550520655881 is 18855602505511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11374997363856 + 175523292025 = 3372684^2 + 418955^2 .

It is a cyclic number.

It is not a de Polignac number, because 11550520655881 - 2¹³ = 11550520647689 is a prime.

It is a super-2 number, since 2×11550520655881² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11550520658881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775260327940 + 5775260327941.

It is an arithmetic number, because the mean of its divisors is an integer number (5775260327941).

Almost surely, 2^{11550520655881} is an apocalyptic number.

It is an amenable number.

11550520655881 is a deficient number, since it is larger than the sum of its proper divisors (1).

11550520655881 is an equidigital number, since it uses as much as digits as its factorization.

11550520655881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400000, while the sum is 52.

The spelling of 11550520655881 in words is "eleven trillion, five hundred fifty billion, five hundred twenty million, six hundred fifty-five thousand, eight hundred eighty-one".