6666155 has 4 divisors (see below), whose sum is σ = 7999392. Its totient is φ = 5332920.

The previous prime is 6666137. The next prime is 6666157. The reversal of 6666155 is 5516666.

6666155 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6666155 - 2¹² = 6662059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666157) 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, 666611 + ... + 666620.

It is an arithmetic number, because the mean of its divisors is an integer number (1999848).

Almost surely, 2^6666155 is an apocalyptic number.

6666155 is a deficient number, since it is larger than the sum of its proper divisors (1333237).

6666155 is a wasteful number, since it uses less digits than its factorization.

6666155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333236.

The product of its digits is 32400, while the sum is 35.

The square root of 6666155 is about 2581.8898117464. The cubic root of 6666155 is about 188.2023906853.

The spelling of 6666155 in words is "six million, six hundred sixty-six thousand, one hundred fifty-five".