6551555 has 4 divisors (see below), whose sum is σ = 7861872. Its totient is φ = 5241240.

The previous prime is 6551533. The next prime is 6551563. The reversal of 6551555 is 5551556.

6551555 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6551555 - 2⁸ = 6551299 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655151 + ... + 655160.

It is an arithmetic number, because the mean of its divisors is an integer number (1965468).

Almost surely, 2^6551555 is an apocalyptic number.

6551555 is a deficient number, since it is larger than the sum of its proper divisors (1310317).

6551555 is a wasteful number, since it uses less digits than its factorization.

6551555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310316.

The product of its digits is 18750, while the sum is 32.

The square root of 6551555 is about 2559.6005547741. The cubic root of 6551555 is about 187.1176683239.

Subtracting from 6551555 its reverse (5551556), we obtain a palindrome (999999).

The spelling of 6551555 in words is "six million, five hundred fifty-one thousand, five hundred fifty-five".