1663533 has 6 divisors (see below), whose sum is σ = 2402894. Its totient is φ = 1109016.

The previous prime is 1663523. The next prime is 1663537. The reversal of 1663533 is 3353661.

It can be written as a sum of positive squares in only one way, i.e., 927369 + 736164 = 963^2 + 858^2 .

It is not a de Polignac number, because 1663533 - 2⁴ = 1663517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663497 and 1663506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92410 + ... + 92427.

2^1663533 is an apocalyptic number.

It is an amenable number.

1663533 is a deficient number, since it is larger than the sum of its proper divisors (739361).

1663533 is a wasteful number, since it uses less digits than its factorization.

1663533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184843 (or 184840 counting only the distinct ones).

The product of its digits is 4860, while the sum is 27.

The square root of 1663533 is about 1289.7802138349. The cubic root of 1663533 is about 118.4887560768.

The spelling of 1663533 in words is "one million, six hundred sixty-three thousand, five hundred thirty-three".