6666555 has 32 divisors (see below), whose sum is σ = 12294144. Its totient is φ = 3021696.

The previous prime is 6666551. The next prime is 6666563. The reversal of 6666555 is 5556666.

It is a happy number.

It is not a de Polignac number, because 6666555 - 2² = 6666551 is a prime.

6666555 is a lucky number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17982 + ... + 18348.

It is an arithmetic number, because the mean of its divisors is an integer number (384192).

Almost surely, 2^6666555 is an apocalyptic number.

6666555 is a deficient number, since it is larger than the sum of its proper divisors (5627589).

6666555 is a wasteful number, since it uses less digits than its factorization.

6666555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555.

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

The square root of 6666555 is about 2581.9672732240. The cubic root of 6666555 is about 188.2061549468.

The spelling of 6666555 in words is "six million, six hundred sixty-six thousand, five hundred fifty-five".