6655644 has 18 divisors (see below), whose sum is σ = 16824080. Its totient is φ = 2218536.

The previous prime is 6655639. The next prime is 6655651. The reversal of 6655644 is 4465566.

It is a happy number.

6655644 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 184879 = 6655644 / (6 + 6 + 5 + 5 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 6655599 and 6655608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92404 + ... + 92475.

Almost surely, 2^6655644 is an apocalyptic number.

It is an amenable number.

6655644 is an abundant number, since it is smaller than the sum of its proper divisors (10168436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6655644 is a wasteful number, since it uses less digits than its factorization.

6655644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184889 (or 184884 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 6655644 is about 2579.8534842118. The cubic root of 6655644 is about 188.1034212914.

The spelling of 6655644 in words is "six million, six hundred fifty-five thousand, six hundred forty-four".