16551656100 has 216 divisors, whose sum is σ = 61898434080. Its totient is φ = 3783205440.

The previous prime is 16551656063. The next prime is 16551656119. The reversal of 16551656100 is 165615561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 69747 + ... + 194853.

Almost surely, 2^16551656100 is an apocalyptic number.

16551656100 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 16551656100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30949217040).

16551656100 is an abundant number, since it is smaller than the sum of its proper divisors (45346777980).

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

16551656100 is a wasteful number, since it uses less digits than its factorization.

16551656100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125144 (or 125124 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 16551656100 in words is "sixteen billion, five hundred fifty-one million, six hundred fifty-six thousand, one hundred".