1663648325 has 24 divisors (see below), whose sum is σ = 2143910400. Its totient is φ = 1279252800.

The previous prime is 1663648313. The next prime is 1663648333. The reversal of 1663648325 is 5238463661.

It is a happy number.

It is not a de Polignac number, because 1663648325 - 2⁴ = 1663648309 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108272 + ... + 122678.

It is an arithmetic number, because the mean of its divisors is an integer number (89329600).

Almost surely, 2^1663648325 is an apocalyptic number.

It is an amenable number.

1663648325 is a deficient number, since it is larger than the sum of its proper divisors (480262075).

1663648325 is a wasteful number, since it uses less digits than its factorization.

1663648325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14597 (or 14592 counting only the distinct ones).

The product of its digits is 622080, while the sum is 44.

The square root of 1663648325 is about 40787.8453096017. The cubic root of 1663648325 is about 1184.9149410482.

The spelling of 1663648325 in words is "one billion, six hundred sixty-three million, six hundred forty-eight thousand, three hundred twenty-five".