6503666 has 16 divisors (see below), whose sum is σ = 10763928. Its totient is φ = 2928000.

The previous prime is 6503663. The next prime is 6503669. The reversal of 6503666 is 6663056.

It is an interprime number because it is at equal distance from previous prime (6503663) and next prime (6503669).

It can be written as a sum of positive squares in 4 ways, for example, as 3136441 + 3367225 = 1771^2 + 1835^2 .

It is not an unprimeable number, because it can be changed into a prime (6503663) 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 7 ways as a sum of consecutive naturals, for example, 1985 + ... + 4116.

Almost surely, 2^6503666 is an apocalyptic number.

6503666 is a deficient number, since it is larger than the sum of its proper divisors (4260262).

6503666 is a wasteful number, since it uses less digits than its factorization.

6503666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6157.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 6503666 is about 2550.2286172028. The cubic root of 6503666 is about 186.6606368517.

The spelling of 6503666 in words is "six million, five hundred three thousand, six hundred sixty-six".