2581560445 has 4 divisors (see below), whose sum is σ = 3097872540. Its totient is φ = 2065248352.

The previous prime is 2581560439. The next prime is 2581560467. The reversal of 2581560445 is 5440651852.

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 2019064356 + 562496089 = 44934^2 + 23717^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581560445 - 2⁵ = 2581560413 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2581560398 and 2581560407.

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, 258156040 + ... + 258156049.

It is an arithmetic number, because the mean of its divisors is an integer number (774468135).

Almost surely, 2^2581560445 is an apocalyptic number.

It is an amenable number.

2581560445 is a deficient number, since it is larger than the sum of its proper divisors (516312095).

2581560445 is an equidigital number, since it uses as much as digits as its factorization.

2581560445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516312094.

The product of its (nonzero) digits is 192000, while the sum is 40.

The square root of 2581560445 is about 50809.0586903556. The cubic root of 2581560445 is about 1371.8104264035.

The spelling of 2581560445 in words is "two billion, five hundred eighty-one million, five hundred sixty thousand, four hundred forty-five".