205145555 has 4 divisors (see below), whose sum is σ = 246174672. Its totient is φ = 164116440.

The previous prime is 205145543. The next prime is 205145557. The reversal of 205145555 is 555541502.

205145555 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 is not a de Polignac number, because 205145555 - 2¹² = 205141459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205145557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20514551 + ... + 20514560.

It is an arithmetic number, because the mean of its divisors is an integer number (61543668).

Almost surely, 2^205145555 is an apocalyptic number.

205145555 is a deficient number, since it is larger than the sum of its proper divisors (41029117).

205145555 is an equidigital number, since it uses as much as digits as its factorization.

205145555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41029116.

The product of its (nonzero) digits is 25000, while the sum is 32.

The square root of 205145555 is about 14322.9031624179. The cubic root of 205145555 is about 589.7763731641.

The spelling of 205145555 in words is "two hundred five million, one hundred forty-five thousand, five hundred fifty-five".