111155121445 has 4 divisors (see below), whose sum is σ = 133386145740. Its totient is φ = 88924097152.

The previous prime is 111155121419. The next prime is 111155121491. The reversal of 111155121445 is 544121551111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544121551111 = 349 ⋅1559087539.

It can be written as a sum of positive squares in 2 ways, for example, as 30042942241 + 81112179204 = 173329^2 + 284802^2 .

It is a cyclic number.

It is not a de Polignac number, because 111155121445 - 2⁹ = 111155120933 is a prime.

It is a super-2 number, since 2×111155121445² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 11115512140 + ... + 11115512149.

It is an arithmetic number, because the mean of its divisors is an integer number (33346536435).

Almost surely, 2^111155121445 is an apocalyptic number.

It is an amenable number.

111155121445 is a deficient number, since it is larger than the sum of its proper divisors (22231024295).

111155121445 is an equidigital number, since it uses as much as digits as its factorization.

111155121445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22231024294.

The product of its digits is 4000, while the sum is 31.

Adding to 111155121445 its reverse (544121551111), we get a palindrome (655276672556).

The spelling of 111155121445 in words is "one hundred eleven billion, one hundred fifty-five million, one hundred twenty-one thousand, four hundred forty-five".