6550551 has 24 divisors (see below), whose sum is σ = 11217024. Its totient is φ = 3742200.

The previous prime is 6550547. The next prime is 6550553. The reversal of 6550551 is 1550556.

6550551 is a `hidden beast` number, since 65 + 50 + 551 = 666.

It is not a de Polignac number, because 6550551 - 2² = 6550547 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6550553) 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 23 ways as a sum of consecutive naturals, for example, 225 + ... + 3626.

It is an arithmetic number, because the mean of its divisors is an integer number (467376).

Almost surely, 2^6550551 is an apocalyptic number.

6550551 is a deficient number, since it is larger than the sum of its proper divisors (4666473).

6550551 is an equidigital number, since it uses as much as digits as its factorization.

6550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3873 (or 3861 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 6550551 is about 2559.4044229078. The cubic root of 6550551 is about 187.1081094871.

It can be divided in two parts, 65505 and 51, that added together give a palindrome (65556).

The spelling of 6550551 in words is "six million, five hundred fifty thousand, five hundred fifty-one".