2561726533 has 2 divisors, whose sum is σ = 2561726534. Its totient is φ = 2561726532.

The previous prime is 2561726491. The next prime is 2561726579. The reversal of 2561726533 is 3356271652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2362154404 + 199572129 = 48602^2 + 14127^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561726533 - 2⁹ = 2561726021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561736533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280863266 + 1280863267.

It is an arithmetic number, because the mean of its divisors is an integer number (1280863267).

Almost surely, 2^2561726533 is an apocalyptic number.

It is an amenable number.

2561726533 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561726533 is an equidigital number, since it uses as much as digits as its factorization.

2561726533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

The square root of 2561726533 is about 50613.5014892272. The cubic root of 2561726533 is about 1368.2882225955.

The spelling of 2561726533 in words is "two billion, five hundred sixty-one million, seven hundred twenty-six thousand, five hundred thirty-three".