6581225581 has 4 divisors (see below), whose sum is σ = 7521400672. Its totient is φ = 5641050492.

The previous prime is 6581225561. The next prime is 6581225593. The reversal of 6581225581 is 1855221856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6581225581 - 2¹⁹ = 6580701293 is a prime.

It is a super-2 number, since 2×6581225581² = 86625060296017575122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6581225561) 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 in 3 ways as a sum of consecutive naturals, for example, 470087535 + ... + 470087548.

It is an arithmetic number, because the mean of its divisors is an integer number (1880350168).

Almost surely, 2^6581225581 is an apocalyptic number.

It is an amenable number.

6581225581 is a deficient number, since it is larger than the sum of its proper divisors (940175091).

6581225581 is an equidigital number, since it uses as much as digits as its factorization.

6581225581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940175090.

The product of its digits is 192000, while the sum is 43.

The square root of 6581225581 is about 81124.7531953102. The cubic root of 6581225581 is about 1873.9971484333.

The spelling of 6581225581 in words is "six billion, five hundred eighty-one million, two hundred twenty-five thousand, five hundred eighty-one".