6553681 has 4 divisors (see below), whose sum is σ = 6779700. Its totient is φ = 6327664.

The previous prime is 6553663. The next prime is 6553733. The reversal of 6553681 is 1863556.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3459600 + 3094081 = 1860^2 + 1759^2 .

It is a cyclic number.

It is not a de Polignac number, because 6553681 - 2¹³ = 6545489 is a prime.

It is a super-2 number, since 2×6553681² = 85901469299522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6553621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112966 + ... + 113023.

It is an arithmetic number, because the mean of its divisors is an integer number (1694925).

Almost surely, 2^6553681 is an apocalyptic number.

It is an amenable number.

6553681 is a deficient number, since it is larger than the sum of its proper divisors (226019).

6553681 is a wasteful number, since it uses less digits than its factorization.

6553681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226018.

The product of its digits is 21600, while the sum is 34.

The square root of 6553681 is about 2560.0158202636. The cubic root of 6553681 is about 187.1379062237.

It can be divided in two parts, 65536 and 81, that multiplied together give a 4-th power (5308416 = 48⁴).

The spelling of 6553681 in words is "six million, five hundred fifty-three thousand, six hundred eighty-one".