16663574656 has 32 divisors (see below), whose sum is σ = 33968998800. Its totient is φ = 8138022144.

The previous prime is 16663574651. The next prime is 16663574687. The reversal of 16663574656 is 65647536661.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 16663574597 and 16663574606.

It is not an unprimeable number, because it can be changed into a prime (16663574651) 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, 1508266 + ... + 1519273.

Almost surely, 2^16663574656 is an apocalyptic number.

16663574656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16663574656 is an abundant number, since it is smaller than the sum of its proper divisors (17305424144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16663574656 is an equidigital number, since it uses as much as digits as its factorization.

16663574656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027596 (or 3027584 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 55.

The spelling of 16663574656 in words is "sixteen billion, six hundred sixty-three million, five hundred seventy-four thousand, six hundred fifty-six".