2805561111111 has 16 divisors (see below), whose sum is σ = 4080848646528. Its totient is φ = 1700326532000.

The previous prime is 2805561111107. The next prime is 2805561111113. The reversal of 2805561111111 is 1111111655082.

It is a cyclic number.

It is not a de Polignac number, because 2805561111111 - 2² = 2805561111107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

2805561111111 is a modest number, since divided by 1111111 gives 280556 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805561111113) 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, 5244961 + ... + 5755061.

It is an arithmetic number, because the mean of its divisors is an integer number (255053040408).

Almost surely, 2^{2805561111111} is an apocalyptic number.

2805561111111 is a deficient number, since it is larger than the sum of its proper divisors (1275287535417).

2805561111111 is a wasteful number, since it uses less digits than its factorization.

2805561111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676782.

The product of its (nonzero) digits is 2400, while the sum is 33.

Adding to 2805561111111 its reverse (1111111655082), we get a palindrome (3916672766193).

The spelling of 2805561111111 in words is "two trillion, eight hundred five billion, five hundred sixty-one million, one hundred eleven thousand, one hundred eleven".