1663361 has 8 divisors (see below), whose sum is σ = 1909824. Its totient is φ = 1419120.

The previous prime is 1663351. The next prime is 1663373. The reversal of 1663361 is 1633661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1663361 - 2¹⁸ = 1401217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1663361.

It is not an unprimeable number, because it can be changed into a prime (1663301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (238728).

2^1663361 is an apocalyptic number.

It is an amenable number.

1663361 is a deficient number, since it is larger than the sum of its proper divisors (246463).

1663361 is an equidigital number, since it uses as much as digits as its factorization.

1663361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111.

The product of its digits is 1944, while the sum is 26.

The square root of 1663361 is about 1289.7135340842. The cubic root of 1663361 is about 118.4846722447.

The spelling of 1663361 in words is "one million, six hundred sixty-three thousand, three hundred sixty-one".