1663525 has 6 divisors (see below), whose sum is σ = 2062802. Its totient is φ = 1330800.

The previous prime is 1663523. The next prime is 1663537. The reversal of 1663525 is 5253661.

It can be written as a sum of positive squares in 3 ways, for example, as 338724 + 1324801 = 582^2 + 1151^2 .

It is not a de Polignac number, because 1663525 - 2¹ = 1663523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663493 and 1663502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663523) 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, 33246 + ... + 33295.

2^1663525 is an apocalyptic number.

It is an amenable number.

1663525 is a deficient number, since it is larger than the sum of its proper divisors (399277).

1663525 is an equidigital number, since it uses as much as digits as its factorization.

1663525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66551 (or 66546 counting only the distinct ones).

The product of its digits is 5400, while the sum is 28.

The square root of 1663525 is about 1289.7771125276. Note that the first 3 decimals coincide. The cubic root of 1663525 is about 118.4885661373.

The spelling of 1663525 in words is "one million, six hundred sixty-three thousand, five hundred twenty-five".