11115518720 has 72 divisors (see below), whose sum is σ = 27484114560. Its totient is φ = 4302766080.

The previous prime is 11115518717. The next prime is 11115518723. The reversal of 11115518720 is 2781551111.

It is an interprime number because it is at equal distance from previous prime (11115518717) and next prime (11115518723).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (11115518723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100385 + ... + 179744.

Almost surely, 2^11115518720 is an apocalyptic number.

11115518720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11115518720 is an abundant number, since it is smaller than the sum of its proper divisors (16368595840).

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

11115518720 is an equidigital number, since it uses as much as digits as its factorization.

11115518720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280181 (or 280167 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 32.

The spelling of 11115518720 in words is "eleven billion, one hundred fifteen million, five hundred eighteen thousand, seven hundred twenty".