55642205 has 4 divisors (see below), whose sum is σ = 66770652. Its totient is φ = 44513760.

The previous prime is 55642193. The next prime is 55642231. The reversal of 55642205 is 50224655.

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 18028516 + 37613689 = 4246^2 + 6133^2 .

It is not a de Polignac number, because 55642205 - 2⁴ = 55642189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5564216 + ... + 5564225.

It is an arithmetic number, because the mean of its divisors is an integer number (16692663).

Almost surely, 2^55642205 is an apocalyptic number.

It is an amenable number.

55642205 is a deficient number, since it is larger than the sum of its proper divisors (11128447).

55642205 is a wasteful number, since it uses less digits than its factorization.

55642205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11128446.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 55642205 is about 7459.3702817329. The cubic root of 55642205 is about 381.7696888441.

The spelling of 55642205 in words is "fifty-five million, six hundred forty-two thousand, two hundred five".