2561326376255 has 4 divisors (see below), whose sum is σ = 3073591651512. Its totient is φ = 2049061101000.

The previous prime is 2561326376251. The next prime is 2561326376263. The reversal of 2561326376255 is 5526736231652.

It is a happy number.

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

It is not a de Polignac number, because 2561326376255 - 2² = 2561326376251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2561326376197 and 2561326376206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561326376251) 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, 256132637621 + ... + 256132637630.

It is an arithmetic number, because the mean of its divisors is an integer number (768397912878).

Almost surely, 2^{2561326376255} is an apocalyptic number.

2561326376255 is a deficient number, since it is larger than the sum of its proper divisors (512265275257).

2561326376255 is an equidigital number, since it uses as much as digits as its factorization.

2561326376255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512265275256.

The product of its digits is 13608000, while the sum is 53.

The spelling of 2561326376255 in words is "two trillion, five hundred sixty-one billion, three hundred twenty-six million, three hundred seventy-six thousand, two hundred fifty-five".