205113220145 has 4 divisors (see below), whose sum is σ = 246135864180. Its totient is φ = 164090576112.

The previous prime is 205113220133. The next prime is 205113220153. The reversal of 205113220145 is 541022311502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57621121936 + 147492098209 = 240044^2 + 384047^2 .

It is a cyclic number.

It is not a de Polignac number, because 205113220145 - 2³⁴ = 187933350961 is a prime.

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, 20511322010 + ... + 20511322019.

It is an arithmetic number, because the mean of its divisors is an integer number (61533966045).

Almost surely, 2^205113220145 is an apocalyptic number.

It is an amenable number.

205113220145 is a deficient number, since it is larger than the sum of its proper divisors (41022644035).

205113220145 is an equidigital number, since it uses as much as digits as its factorization.

205113220145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41022644034.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 205113220145 its reverse (541022311502), we get a palindrome (746135531647).

The spelling of 205113220145 in words is "two hundred five billion, one hundred thirteen million, two hundred twenty thousand, one hundred forty-five".