111220555613 has 12 divisors (see below), whose sum is σ = 116419681308. Its totient is φ = 106244698560.

The previous prime is 111220555577. The next prime is 111220555627. The reversal of 111220555613 is 316555022111.

It can be written as a sum of positive squares in 2 ways, for example, as 6064982884 + 105155572729 = 77878^2 + 324277^2 .

It is not a de Polignac number, because 111220555613 - 2⁶ = 111220555549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111220555613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220558613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264431 + ... + 540707.

It is an arithmetic number, because the mean of its divisors is an integer number (9701640109).

Almost surely, 2^111220555613 is an apocalyptic number.

It is an amenable number.

111220555613 is a deficient number, since it is larger than the sum of its proper divisors (5199125695).

111220555613 is an equidigital number, since it uses as much as digits as its factorization.

111220555613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277084 (or 277061 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

Adding to 111220555613 its reverse (316555022111), we get a palindrome (427775577724).

The spelling of 111220555613 in words is "one hundred eleven billion, two hundred twenty million, five hundred fifty-five thousand, six hundred thirteen".