55205643 has 8 divisors (see below), whose sum is σ = 73709568. Its totient is φ = 36752744.

The previous prime is 55205641. The next prime is 55205653. The reversal of 55205643 is 34650255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55205643 - 2¹ = 55205641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55205643.

It is not an unprimeable number, because it can be changed into a prime (55205641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10155 + ... + 14612.

It is an arithmetic number, because the mean of its divisors is an integer number (9213696).

Almost surely, 2^55205643 is an apocalyptic number.

55205643 is a deficient number, since it is larger than the sum of its proper divisors (18503925).

55205643 is a wasteful number, since it uses less digits than its factorization.

55205643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25513.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 55205643 is about 7430.0499998318. The cubic root of 55205643 is about 380.7686266133.

Adding to 55205643 its reverse (34650255), we get a palindrome (89855898).

The spelling of 55205643 in words is "fifty-five million, two hundred five thousand, six hundred forty-three".