55105511 has 4 divisors (see below), whose sum is σ = 55219152. Its totient is φ = 54991872.

The previous prime is 55105451. The next prime is 55105537. The reversal of 55105511 is 11550155.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55105511 is a prime.

It is a super-2 number, since 2×55105511² = 6073234685142242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55105541) 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, 56090 + ... + 57063.

It is an arithmetic number, because the mean of its divisors is an integer number (13804788).

Almost surely, 2^55105511 is an apocalyptic number.

55105511 is a deficient number, since it is larger than the sum of its proper divisors (113641).

55105511 is a wasteful number, since it uses less digits than its factorization.

55105511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113640.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 55105511 is about 7423.3086289067. The cubic root of 55105511 is about 380.5382745637.

Adding to 55105511 its reverse (11550155), we get a palindrome (66655666).

The spelling of 55105511 in words is "fifty-five million, one hundred five thousand, five hundred eleven".