11185278667 has 4 divisors (see below), whose sum is σ = 11185496280. Its totient is φ = 11185061056.

The previous prime is 11185278541. The next prime is 11185278683. The reversal of 11185278667 is 76687258111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76687258111 = 17 ⋅4511015183.

It is a cyclic number.

It is not a de Polignac number, because 11185278667 - 2¹⁵ = 11185245899 is a prime.

It is a super-2 number, since 2×11185278667² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11185278697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16059 + ... + 150427.

It is an arithmetic number, because the mean of its divisors is an integer number (2796374070).

Almost surely, 2^11185278667 is an apocalyptic number.

11185278667 is a deficient number, since it is larger than the sum of its proper divisors (217613).

11185278667 is an equidigital number, since it uses as much as digits as its factorization.

11185278667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217612.

The product of its digits is 1128960, while the sum is 52.

The spelling of 11185278667 in words is "eleven billion, one hundred eighty-five million, two hundred seventy-eight thousand, six hundred sixty-seven".