6553665 has 12 divisors (see below), whose sum is σ = 11359764. Its totient is φ = 3495264.

The previous prime is 6553663. The next prime is 6553733. The reversal of 6553665 is 5663556.

It is a happy number.

6553665 is a `hidden beast` number, since 65 + 536 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2537649 + 4016016 = 1593^2 + 2004^2 .

It is not a de Polignac number, because 6553665 - 2¹ = 6553663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6553663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72774 + ... + 72863.

It is an arithmetic number, because the mean of its divisors is an integer number (946647).

Almost surely, 2^6553665 is an apocalyptic number.

It is an amenable number.

6553665 is a deficient number, since it is larger than the sum of its proper divisors (4806099).

6553665 is a wasteful number, since it uses less digits than its factorization.

6553665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145648 (or 145645 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 6553665 is about 2560.0126952810. The cubic root of 6553665 is about 187.1377539322.

The spelling of 6553665 in words is "six million, five hundred fifty-three thousand, six hundred sixty-five".