16809122500 has 45 divisors (see below), whose sum is σ = 36772370481. Its totient is φ = 6721056000.

The previous prime is 16809122489. The next prime is 16809122527. The reversal of 16809122500 is 522190861.

The square root of 16809122500 is 129650.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 11352050116 + 5457072384 = 106546^2 + 73872^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6481204 + ... + 6483796.

Almost surely, 2^16809122500 is an apocalyptic number.

16809122500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16809122500 is the 129650-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16809122500

16809122500 is an abundant number, since it is smaller than the sum of its proper divisors (19963247981).

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

16809122500 is an frugal number, since it uses more digits than its factorization.

16809122500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5210 (or 2600 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 16809122500 in words is "sixteen billion, eight hundred nine million, one hundred twenty-two thousand, five hundred".