11111355680 has 24 divisors (see below), whose sum is σ = 26250578172. Its totient is φ = 4444542208.

The previous prime is 11111355659. The next prime is 11111355691. The reversal of 11111355680 is 8655311111.

It can be written as a sum of positive squares in 2 ways, for example, as 11064515344 + 46840336 = 105188^2 + 6844^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34722827 + ... + 34723146.

Almost surely, 2^11111355680 is an apocalyptic number.

11111355680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111355680 is an abundant number, since it is smaller than the sum of its proper divisors (15139222492).

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

11111355680 is an equidigital number, since it uses as much as digits as its factorization.

11111355680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69445988 (or 69445980 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 32.

Adding to 11111355680 its reverse (8655311111), we get a palindrome (19766666791).

The spelling of 11111355680 in words is "eleven billion, one hundred eleven million, three hundred fifty-five thousand, six hundred eighty".