6555666 has 16 divisors (see below), whose sum is σ = 14120064. Its totient is φ = 2017104.

The previous prime is 6555649. The next prime is 6555671. The reversal of 6555666 is 6665556.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41946 + ... + 42101.

It is an arithmetic number, because the mean of its divisors is an integer number (882504).

Almost surely, 2^6555666 is an apocalyptic number.

6555666 is an abundant number, since it is smaller than the sum of its proper divisors (7564398).

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

6555666 is a wasteful number, since it uses less digits than its factorization.

6555666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84065.

The product of its digits is 162000, while the sum is 39.

The square root of 6555666 is about 2560.4034838283. The cubic root of 6555666 is about 187.1567979603.

The spelling of 6555666 in words is "six million, five hundred fifty-five thousand, six hundred sixty-six".