11115205530 has 128 divisors (see below), whose sum is σ = 31808802816. Its totient is φ = 2450131200.

The previous prime is 11115205433. The next prime is 11115205573. The reversal of 11115205530 is 3550251111.

It is a self number, because there is not a number n which added to its sum of digits gives 11115205530.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 268095 + ... + 306765.

It is an arithmetic number, because the mean of its divisors is an integer number (248506272).

Almost surely, 2^11115205530 is an apocalyptic number.

11115205530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11115205530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15904401408).

11115205530 is an abundant number, since it is smaller than the sum of its proper divisors (20693597286).

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

11115205530 is a wasteful number, since it uses less digits than its factorization.

11115205530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38772.

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 11115205530 its reverse (3550251111), we get a palindrome (14665456641).

The spelling of 11115205530 in words is "eleven billion, one hundred fifteen million, two hundred five thousand, five hundred thirty".