255531261005 has 4 divisors (see below), whose sum is σ = 306637513212. Its totient is φ = 204425008800.

The previous prime is 255531260969. The next prime is 255531261017. The reversal of 255531261005 is 500162135552.

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 91990283401 + 163540977604 = 303299^2 + 404402^2 .

It is not a de Polignac number, because 255531261005 - 2⁸ = 255531260749 is a prime.

It is a super-2 number, since 2×255531261005² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 25553126096 + ... + 25553126105.

It is an arithmetic number, because the mean of its divisors is an integer number (76659378303).

Almost surely, 2^255531261005 is an apocalyptic number.

It is an amenable number.

255531261005 is a deficient number, since it is larger than the sum of its proper divisors (51106252207).

255531261005 is an equidigital number, since it uses as much as digits as its factorization.

255531261005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51106252206.

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 255531261005 its reverse (500162135552), we get a palindrome (755693396557).

The spelling of 255531261005 in words is "two hundred fifty-five billion, five hundred thirty-one million, two hundred sixty-one thousand, five".