208255561 has 8 divisors (see below), whose sum is σ = 219350880. Its totient is φ = 197173728.

The previous prime is 208255529. The next prime is 208255609. The reversal of 208255561 is 165552802.

208255561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 208255561 - 2⁵ = 208255529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208255361) 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, 50790 + ... + 54736.

It is an arithmetic number, because the mean of its divisors is an integer number (27418860).

Almost surely, 2^208255561 is an apocalyptic number.

It is an amenable number.

208255561 is a deficient number, since it is larger than the sum of its proper divisors (11095319).

208255561 is a wasteful number, since it uses less digits than its factorization.

208255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6743.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 208255561 is about 14431.0623656057. The cubic root of 208255561 is about 592.7417741293.

The spelling of 208255561 in words is "two hundred eight million, two hundred fifty-five thousand, five hundred sixty-one".