255442343055321 has 4 divisors (see below), whose sum is σ = 340589790740432. Its totient is φ = 170294895370212.

The previous prime is 255442343055307. The next prime is 255442343055379. The reversal of 255442343055321 is 123550343244552.

It is a happy number.

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 not a de Polignac number, because 255442343055321 - 2¹⁵ = 255442343022553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255442343055301) 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, 42573723842551 + ... + 42573723842556.

It is an arithmetic number, because the mean of its divisors is an integer number (85147447685108).

Almost surely, 2^{255442343055321} is an apocalyptic number.

It is an amenable number.

255442343055321 is a deficient number, since it is larger than the sum of its proper divisors (85147447685111).

255442343055321 is an equidigital number, since it uses as much as digits as its factorization.

255442343055321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85147447685110.

The product of its (nonzero) digits is 8640000, while the sum is 48.

Adding to 255442343055321 its reverse (123550343244552), we get a palindrome (378992686299873).

The spelling of 255442343055321 in words is "two hundred fifty-five trillion, four hundred forty-two billion, three hundred forty-three million, fifty-five thousand, three hundred twenty-one".