55561111110 has 64 divisors (see below), whose sum is σ = 148218840000. Its totient is φ = 14810708736.

The previous prime is 55561111093. The next prime is 55561111139. The reversal of 55561111110 is 1111116555.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 704802 + ... + 779658.

It is an arithmetic number, because the mean of its divisors is an integer number (2315919375).

Almost surely, 2^55561111110 is an apocalyptic number.

55561111110 is an abundant number, since it is smaller than the sum of its proper divisors (92657728890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55561111110 is a wasteful number, since it uses less digits than its factorization.

55561111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77622 (or 77616 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 27.

Adding to 55561111110 its reverse (1111116555), we get a palindrome (56672227665).

It can be divided in two parts, 55 and 561111110, that added together give a palindrome (561111165).

The spelling of 55561111110 in words is "fifty-five billion, five hundred sixty-one million, one hundred eleven thousand, one hundred ten".