6557649 has 8 divisors (see below), whose sum is σ = 9992640. Its totient is φ = 3747216.

The previous prime is 6557623. The next prime is 6557651. The reversal of 6557649 is 9467556.

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

It is not a de Polignac number, because 6557649 - 2⁷ = 6557521 is a prime.

6557649 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6557649.

It is not an unprimeable number, because it can be changed into a prime (6557659) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 156114 + ... + 156155.

It is an arithmetic number, because the mean of its divisors is an integer number (1249080).

Almost surely, 2^6557649 is an apocalyptic number.

It is an amenable number.

6557649 is a deficient number, since it is larger than the sum of its proper divisors (3434991).

6557649 is a wasteful number, since it uses less digits than its factorization.

6557649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312279.

The product of its digits is 226800, while the sum is 42.

The square root of 6557649 is about 2560.7906982024. The cubic root of 6557649 is about 187.1756668551.

The spelling of 6557649 in words is "six million, five hundred fifty-seven thousand, six hundred forty-nine".