16620543809100 has 432 divisors, whose sum is σ = 65056507117056. Its totient is φ = 3448013184000.

The previous prime is 16620543809083. The next prime is 16620543809113. The reversal of 16620543809100 is 190834502661.

16620543809100 is a `hidden beast` number, since 1 + 6 + 6 + 20 + 543 + 80 + 9 + 1 + 0 + 0 = 666.

16620543809100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 143 ways as a sum of consecutive naturals, for example, 42563745 + ... + 42952455.

Almost surely, 2^{16620543809100} is an apocalyptic number.

16620543809100 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 16620543809100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32528253558528).

16620543809100 is an abundant number, since it is smaller than the sum of its proper divisors (48435963307956).

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

16620543809100 is a wasteful number, since it uses less digits than its factorization.

16620543809100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389366 (or 389356 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 16620543809100 in words is "sixteen trillion, six hundred twenty billion, five hundred forty-three million, eight hundred nine thousand, one hundred".