3663566 has 4 divisors (see below), whose sum is σ = 5495352. Its totient is φ = 1831782.

The previous prime is 3663563. The next prime is 3663577. The reversal of 3663566 is 6653663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6653663 = 1663 ⋅4001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3663563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915890 + ... + 915893.

It is an arithmetic number, because the mean of its divisors is an integer number (1373838).

Almost surely, 2^3663566 is an apocalyptic number.

3663566 is a deficient number, since it is larger than the sum of its proper divisors (1831786).

3663566 is a wasteful number, since it uses less digits than its factorization.

3663566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831785.

The product of its digits is 58320, while the sum is 35.

The square root of 3663566 is about 1914.0444090982. The cubic root of 3663566 is about 154.1586883949.

The spelling of 3663566 in words is "three million, six hundred sixty-three thousand, five hundred sixty-six".