6581771855 has 12 divisors (see below), whose sum is σ = 8335697832. Its totient is φ = 4988288880.

The previous prime is 6581771849. The next prime is 6581771857. The reversal of 6581771855 is 5581771856.

It is not a de Polignac number, because 6581771855 - 2²⁸ = 6313336399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6581771797 and 6581771806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6581771857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1821401 + ... + 1825010.

It is an arithmetic number, because the mean of its divisors is an integer number (694641486).

Almost surely, 2^6581771855 is an apocalyptic number.

6581771855 is a deficient number, since it is larger than the sum of its proper divisors (1753925977).

6581771855 is a wasteful number, since it uses less digits than its factorization.

6581771855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646454 (or 3646435 counting only the distinct ones).

The product of its digits is 2352000, while the sum is 53.

The square root of 6581771855 is about 81128.1200016369. The cubic root of 6581771855 is about 1874.0489973168.

Subtracting from 6581771855 its reverse (5581771856), we obtain a palindrome (999999999).

The spelling of 6581771855 in words is "six billion, five hundred eighty-one million, seven hundred seventy-one thousand, eight hundred fifty-five".