6666505 has 16 divisors (see below), whose sum is σ = 8293824. Its totient is φ = 5140800.

The previous prime is 6666487. The next prime is 6666509. The reversal of 6666505 is 5056666.

It is not a de Polignac number, because 6666505 - 2²¹ = 4569353 is a prime.

It is a Duffinian number.

6666505 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6666509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21562 + ... + 21868.

It is an arithmetic number, because the mean of its divisors is an integer number (518364).

Almost surely, 2^6666505 is an apocalyptic number.

It is an amenable number.

6666505 is a deficient number, since it is larger than the sum of its proper divisors (1627319).

6666505 is a wasteful number, since it uses less digits than its factorization.

6666505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 6666505 is about 2581.9575906664. The cubic root of 6666505 is about 188.2056844223.

The spelling of 6666505 in words is "six million, six hundred sixty-six thousand, five hundred five".