1663366 has 4 divisors (see below), whose sum is σ = 2495052. Its totient is φ = 831682.

The previous prime is 1663351. The next prime is 1663373. The reversal of 1663366 is 6633661.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415840 + ... + 415843.

It is an arithmetic number, because the mean of its divisors is an integer number (623763).

2^1663366 is an apocalyptic number.

1663366 is a deficient number, since it is larger than the sum of its proper divisors (831686).

1663366 is an equidigital number, since it uses as much as digits as its factorization.

1663366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831685.

The product of its digits is 11664, while the sum is 31.

The square root of 1663366 is about 1289.7154724977. The cubic root of 1663366 is about 118.4847909647.

The spelling of 1663366 in words is "one million, six hundred sixty-three thousand, three hundred sixty-six".