1663553 has 8 divisors (see below), whose sum is σ = 1737216. Its totient is φ = 1591200.

The previous prime is 1663549. The next prime is 1663579. The reversal of 1663553 is 3553661.

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 1663553 - 2² = 1663549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663513) 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, 2933 + ... + 3453.

It is an arithmetic number, because the mean of its divisors is an integer number (217152).

2^1663553 is an apocalyptic number.

It is an amenable number.

1663553 is a deficient number, since it is larger than the sum of its proper divisors (73663).

1663553 is a wasteful number, since it uses less digits than its factorization.

1663553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655.

The product of its digits is 8100, while the sum is 29.

The square root of 1663553 is about 1289.7879670706. The cubic root of 1663553 is about 118.4892309227.

The spelling of 1663553 in words is "one million, six hundred sixty-three thousand, five hundred fifty-three".