205515455 has 4 divisors (see below), whose sum is σ = 246618552. Its totient is φ = 164412360.

The previous prime is 205515451. The next prime is 205515491. The reversal of 205515455 is 554515502.

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

It is not a de Polignac number, because 205515455 - 2² = 205515451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205515451) 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, 20551541 + ... + 20551550.

It is an arithmetic number, because the mean of its divisors is an integer number (61654638).

Almost surely, 2^205515455 is an apocalyptic number.

205515455 is a deficient number, since it is larger than the sum of its proper divisors (41103097).

205515455 is an equidigital number, since it uses as much as digits as its factorization.

205515455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41103096.

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

The square root of 205515455 is about 14335.8102317239. The cubic root of 205515455 is about 590.1306375473.

The spelling of 205515455 in words is "two hundred five million, five hundred fifteen thousand, four hundred fifty-five".