11205220278 has 16 divisors (see below), whose sum is σ = 25611932160. Its totient is φ = 3201491496.

The previous prime is 11205220259. The next prime is 11205220283. The reversal of 11205220278 is 87202250211.

It is a super-2 number, since 2×11205220278² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 133395438 + ... + 133395521.

It is an arithmetic number, because the mean of its divisors is an integer number (1600745760).

Almost surely, 2^11205220278 is an apocalyptic number.

11205220278 is an abundant number, since it is smaller than the sum of its proper divisors (14406711882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11205220278 is a wasteful number, since it uses less digits than its factorization.

11205220278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266790971.

The product of its (nonzero) digits is 4480, while the sum is 30.

Adding to 11205220278 its reverse (87202250211), we get a palindrome (98407470489).

The spelling of 11205220278 in words is "eleven billion, two hundred five million, two hundred twenty thousand, two hundred seventy-eight".