1100561111111 has 16 divisors (see below), whose sum is σ = 1400130758400. Its totient is φ = 857580083640.

The previous prime is 1100561111107. The next prime is 1100561111129. The reversal of 1100561111111 is 1111111650011.

It is a happy number.

It is not a de Polignac number, because 1100561111111 - 2² = 1100561111107 is a prime.

It is a super-2 number, since 2×1100561111111² (a number of 25 digits) contains 22 as substring.

1100561111111 is a modest number, since divided by 1111111 gives 110056 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100561111101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145843181 + ... + 145850726.

It is an arithmetic number, because the mean of its divisors is an integer number (87508172400).

Almost surely, 2^{1100561111111} is an apocalyptic number.

1100561111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1100561111111 is a deficient number, since it is larger than the sum of its proper divisors (299569647289).

1100561111111 is an equidigital number, since it uses as much as digits as its factorization.

1100561111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291693939 (or 291693925 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 20.

Adding to 1100561111111 its reverse (1111111650011), we get a palindrome (2211672761122).

It can be divided in two parts, 11005 and 61111111, that added together give a palindrome (61122116).

The spelling of 1100561111111 in words is "one trillion, one hundred billion, five hundred sixty-one million, one hundred eleven thousand, one hundred eleven".