1663616325 has 48 divisors (see below), whose sum is σ = 3147227136. Its totient is φ = 759595200.

The previous prime is 1663616323. The next prime is 1663616329. The reversal of 1663616325 is 5236163661.

It is a happy number.

It is not a de Polignac number, because 1663616325 - 2¹ = 1663616323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663616321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 640780 + ... + 643370.

It is an arithmetic number, because the mean of its divisors is an integer number (65567232).

Almost surely, 2^1663616325 is an apocalyptic number.

1663616325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663616325 is a deficient number, since it is larger than the sum of its proper divisors (1483610811).

1663616325 is a wasteful number, since it uses less digits than its factorization.

1663616325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834 (or 3829 counting only the distinct ones).

The product of its digits is 116640, while the sum is 39.

The square root of 1663616325 is about 40787.4530339907. The cubic root of 1663616325 is about 1184.9073437852.

Adding to 1663616325 its reverse (5236163661), we get a palindrome (6899779986).

The spelling of 1663616325 in words is "one billion, six hundred sixty-three million, six hundred sixteen thousand, three hundred twenty-five".