225705163561555 has 4 divisors (see below), whose sum is σ = 270846196273872. Its totient is φ = 180564130849240.

The previous prime is 225705163561517. The next prime is 225705163561571. The reversal of 225705163561555 is 555165361507522.

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

It is not a de Polignac number, because 225705163561555 - 2⁹ = 225705163561043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225705163561555.

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, 22570516356151 + ... + 22570516356160.

It is an arithmetic number, because the mean of its divisors is an integer number (67711549068468).

Almost surely, 2^{225705163561555} is an apocalyptic number.

225705163561555 is a deficient number, since it is larger than the sum of its proper divisors (45141032712317).

225705163561555 is an equidigital number, since it uses as much as digits as its factorization.

225705163561555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45141032712316.

The product of its (nonzero) digits is 47250000, while the sum is 58.

The spelling of 225705163561555 in words is "two hundred twenty-five trillion, seven hundred five billion, one hundred sixty-three million, five hundred sixty-one thousand, five hundred fifty-five".