205551155 has 4 divisors (see below), whose sum is σ = 246661392. Its totient is φ = 164440920.

The previous prime is 205551133. The next prime is 205551167. The reversal of 205551155 is 551155502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 205551155 - 2⁶ = 205551091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20555111 + ... + 20555120.

It is an arithmetic number, because the mean of its divisors is an integer number (61665348).

Almost surely, 2^205551155 is an apocalyptic number.

205551155 is a deficient number, since it is larger than the sum of its proper divisors (41110237).

205551155 is an equidigital number, since it uses as much as digits as its factorization.

205551155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41110236.

The product of its (nonzero) digits is 6250, while the sum is 29.

The square root of 205551155 is about 14337.0553113253. The cubic root of 205551155 is about 590.1648060141.

The spelling of 205551155 in words is "two hundred five million, five hundred fifty-one thousand, one hundred fifty-five".