16663566600 has 432 divisors, whose sum is σ = 60217485120. Its totient is φ = 4128307200.

The previous prime is 16663566593. The next prime is 16663566641. The reversal of 16663566600 is 666536661.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 53580445 + ... + 53580755.

Almost surely, 2^16663566600 is an apocalyptic number.

16663566600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16663566600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30108742560).

16663566600 is an abundant number, since it is smaller than the sum of its proper divisors (43553918520).

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

16663566600 is a wasteful number, since it uses less digits than its factorization.

16663566600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 16663566600 in words is "sixteen billion, six hundred sixty-three million, five hundred sixty-six thousand, six hundred".