2545726805 has 4 divisors (see below), whose sum is σ = 3054872172. Its totient is φ = 2036581440.

The previous prime is 2545726801. The next prime is 2545726817. The reversal of 2545726805 is 5086275452.

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 1725820849 + 819905956 = 41543^2 + 28634^2 .

It is not a de Polignac number, because 2545726805 - 2² = 2545726801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545726801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254572676 + ... + 254572685.

It is an arithmetic number, because the mean of its divisors is an integer number (763718043).

Almost surely, 2^2545726805 is an apocalyptic number.

It is an amenable number.

2545726805 is a deficient number, since it is larger than the sum of its proper divisors (509145367).

2545726805 is an equidigital number, since it uses as much as digits as its factorization.

2545726805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509145366.

The product of its (nonzero) digits is 672000, while the sum is 44.

The square root of 2545726805 is about 50455.1960158713. The cubic root of 2545726805 is about 1365.4336405744.

The spelling of 2545726805 in words is "two billion, five hundred forty-five million, seven hundred twenty-six thousand, eight hundred five".