55618445 has 4 divisors (see below), whose sum is σ = 66742140. Its totient is φ = 44494752.

The previous prime is 55618429. The next prime is 55618457. The reversal of 55618445 is 54481655.

It is a happy number.

55618445 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 11276164 + 44342281 = 3358^2 + 6659^2 .

It is a cyclic number.

It is not a de Polignac number, because 55618445 - 2⁴ = 55618429 is a prime.

It is a super-2 number, since 2×55618445² = 6186822848436050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55618399 and 55618408.

It is a congruent 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, 5561840 + ... + 5561849.

It is an arithmetic number, because the mean of its divisors is an integer number (16685535).

Almost surely, 2^55618445 is an apocalyptic number.

It is an amenable number.

55618445 is a deficient number, since it is larger than the sum of its proper divisors (11123695).

55618445 is a wasteful number, since it uses less digits than its factorization.

55618445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11123694.

The product of its digits is 96000, while the sum is 38.

The square root of 55618445 is about 7457.7774839425. Note that the first 3 decimals coincide. The cubic root of 55618445 is about 381.7153407748.

The spelling of 55618445 in words is "fifty-five million, six hundred eighteen thousand, four hundred forty-five".