1663543696 has 20 divisors (see below), whose sum is σ = 3231009100. Its totient is φ = 829734912.

The previous prime is 1663543691. The next prime is 1663543699. The reversal of 1663543696 is 6963453661.

It can be written as a sum of positive squares in 2 ways, for example, as 603390096 + 1060153600 = 24564^2 + 32560^2 .

It is not an unprimeable number, because it can be changed into a prime (1663543691) 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, 120561 + ... + 133648.

It is an arithmetic number, because the mean of its divisors is an integer number (161550455).

Almost surely, 2^1663543696 is an apocalyptic number.

1663543696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1663543696 is a deficient number, since it is larger than the sum of its proper divisors (1567465404).

1663543696 is a wasteful number, since it uses less digits than its factorization.

1663543696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254626 (or 254620 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 49.

The square root of 1663543696 is about 40786.5626891995. The cubic root of 1663543696 is about 1184.8901002485.

The spelling of 1663543696 in words is "one billion, six hundred sixty-three million, five hundred forty-three thousand, six hundred ninety-six".