111111010101101 has 4 divisors (see below), whose sum is σ = 117646951871772. Its totient is φ = 104575068330432.

The previous prime is 111111010101079. The next prime is 111111010101139. The reversal of 111111010101101 is 101101010111111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90522094776100 + 20588915325001 = 9514310^2 + 4537501^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111010101101 - 2³⁸ = 110836132194157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111010121101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3267970885310 + ... + 3267970885343.

It is an arithmetic number, because the mean of its divisors is an integer number (29411737967943).

Almost surely, 2^{111111010101101} is an apocalyptic number.

It is an amenable number.

111111010101101 is a deficient number, since it is larger than the sum of its proper divisors (6535941770671).

111111010101101 is an equidigital number, since it uses as much as digits as its factorization.

111111010101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6535941770670.

The product of its (nonzero) digits is 1, while the sum is 11.

Adding to 111111010101101 its reverse (101101010111111), we get a palindrome (212212020212212).

It can be divided in two parts, 111111010 and 101101, that added together give a palindrome (111212111).

The spelling of 111111010101101 in words is "one hundred eleven trillion, one hundred eleven billion, ten million, one hundred one thousand, one hundred one".