6665523 has 16 divisors (see below), whose sum is σ = 9409920. Its totient is φ = 4185216.

The previous prime is 6665497. The next prime is 6665537. The reversal of 6665523 is 3255666.

It is not a de Polignac number, because 6665523 - 2⁹ = 6665011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19036 + ... + 19382.

It is an arithmetic number, because the mean of its divisors is an integer number (588120).

Almost surely, 2^6665523 is an apocalyptic number.

6665523 is a deficient number, since it is larger than the sum of its proper divisors (2744397).

6665523 is a wasteful number, since it uses less digits than its factorization.

6665523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706.

The product of its digits is 32400, while the sum is 33.

The square root of 6665523 is about 2581.7674178748. The cubic root of 6665523 is about 188.1964428453.

The spelling of 6665523 in words is "six million, six hundred sixty-five thousand, five hundred twenty-three".