1663648589 has 4 divisors (see below), whose sum is σ = 1670913660. Its totient is φ = 1656383520.

The previous prime is 1663648583. The next prime is 1663648619. The reversal of 1663648589 is 9858463661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9858463661 = 139 ⋅70924199.

It can be written as a sum of positive squares in 2 ways, for example, as 1405500100 + 258148489 = 37490^2 + 16067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663648589 - 2⁸ = 1663648333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663648583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3632192 + ... + 3632649.

It is an arithmetic number, because the mean of its divisors is an integer number (417728415).

Almost surely, 2^1663648589 is an apocalyptic number.

It is an amenable number.

1663648589 is a deficient number, since it is larger than the sum of its proper divisors (7265071).

1663648589 is an equidigital number, since it uses as much as digits as its factorization.

1663648589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7265070.

The product of its digits is 7464960, while the sum is 56.

The square root of 1663648589 is about 40787.8485458598. The cubic root of 1663648589 is about 1184.9150037252.

The spelling of 1663648589 in words is "one billion, six hundred sixty-three million, six hundred forty-eight thousand, five hundred eighty-nine".