255800161 has 4 divisors (see below), whose sum is σ = 256378032. Its totient is φ = 255222292.

The previous prime is 255800143. The next prime is 255800231. The reversal of 255800161 is 161008552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255800161 - 2¹¹ = 255798113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255800261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288271 + ... + 289156.

It is an arithmetic number, because the mean of its divisors is an integer number (64094508).

Almost surely, 2^255800161 is an apocalyptic number.

It is an amenable number.

255800161 is a deficient number, since it is larger than the sum of its proper divisors (577871).

255800161 is an equidigital number, since it uses as much as digits as its factorization.

255800161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577870.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 255800161 is about 15993.7538120355. The cubic root of 255800161 is about 634.7951566109.

The spelling of 255800161 in words is "two hundred fifty-five million, eight hundred thousand, one hundred sixty-one".