16900780009 has 3 divisors (see below), whose sum is σ = 16900910013. Its totient is φ = 16900650006.

The previous prime is 16900779953. The next prime is 16900780019. The reversal of 16900780009 is 90008700961.

The square root of 16900780009 is 130003.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90008700961 = 29 ⋅3103748309.

It is not a de Polignac number, because 16900780009 - 2⁷ = 16900779881 is a prime.

It is a super-2 number, since 2×16900780009² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16900780019) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 65002 + ... + 195004.

It is an arithmetic number, because the mean of its divisors is an integer number (5633636671).

Almost surely, 2^16900780009 is an apocalyptic number.

16900780009 is the 130003-rd square number.

16900780009 is the 65002-nd centered octagonal number.

It is an amenable number.

16900780009 is a deficient number, since it is larger than the sum of its proper divisors (130004).

16900780009 is an frugal number, since it uses more digits than its factorization.

16900780009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260006 (or 130003 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The spelling of 16900780009 in words is "sixteen billion, nine hundred million, seven hundred eighty thousand, nine".