55505665 has 4 divisors (see below), whose sum is σ = 66606804. Its totient is φ = 44404528.

The previous prime is 55505657. The next prime is 55505683. The reversal of 55505665 is 56650555.

55505665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 35426304 + 20079361 = 5952^2 + 4481^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505665 - 2³ = 55505657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5550562 + ... + 5550571.

It is an arithmetic number, because the mean of its divisors is an integer number (16651701).

Almost surely, 2^55505665 is an apocalyptic number.

It is an amenable number.

55505665 is a deficient number, since it is larger than the sum of its proper divisors (11101139).

55505665 is a wasteful number, since it uses less digits than its factorization.

55505665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101138.

The product of its (nonzero) digits is 112500, while the sum is 37.

The square root of 55505665 is about 7450.2124130792. The cubic root of 55505665 is about 381.4571591171.

The spelling of 55505665 in words is "fifty-five million, five hundred five thousand, six hundred sixty-five".