11284387985 has 16 divisors (see below), whose sum is σ = 14663485200. Its totient is φ = 8287038720.

The previous prime is 11284387981. The next prime is 11284387991. The reversal of 11284387985 is 58978348211.

It is a Cunningham number, because it is equal to 106228²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 2908660624 + 8375727361 = 53932^2 + 91519^2 .

It is not a de Polignac number, because 11284387985 - 2² = 11284387981 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 11284387985.

It is not an unprimeable number, because it can be changed into a prime (11284387981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 467810 + ... + 491339.

It is an arithmetic number, because the mean of its divisors is an integer number (916467825).

Almost surely, 2^11284387985 is an apocalyptic number.

It is an amenable number.

11284387985 is a deficient number, since it is larger than the sum of its proper divisors (3379097215).

11284387985 is a wasteful number, since it uses less digits than its factorization.

11284387985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959348.

The product of its digits is 3870720, while the sum is 56.

The spelling of 11284387985 in words is "eleven billion, two hundred eighty-four million, three hundred eighty-seven thousand, nine hundred eighty-five".