6550661 has 8 divisors (see below), whose sum is σ = 7469784. Its totient is φ = 5690880.

The previous prime is 6550651. The next prime is 6550669. The reversal of 6550661 is 1660556.

6550661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2220100 + 4330561 = 1490^2 + 2081^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6550661 - 2¹⁸ = 6288517 is a prime.

It is a super-2 number, since 2×6550661² = 85822319073842, 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 (6550669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14600 + ... + 15041.

It is an arithmetic number, because the mean of its divisors is an integer number (933723).

Almost surely, 2^6550661 is an apocalyptic number.

It is an amenable number.

6550661 is a deficient number, since it is larger than the sum of its proper divisors (919123).

6550661 is a wasteful number, since it uses less digits than its factorization.

6550661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29671.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 6550661 is about 2559.4259121920. The cubic root of 6550661 is about 187.1091568176.

The spelling of 6550661 in words is "six million, five hundred fifty thousand, six hundred sixty-one".