16680822505 has 4 divisors (see below), whose sum is σ = 20016987012. Its totient is φ = 13344658000.

The previous prime is 16680822469. The next prime is 16680822511. The reversal of 16680822505 is 50522808661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50522808661 = 13 ⋅3886369897.

It can be written as a sum of positive squares in 2 ways, for example, as 5388147216 + 11292675289 = 73404^2 + 106267^2 .

It is not a de Polignac number, because 16680822505 - 2²¹ = 16678725353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668082246 + ... + 1668082255.

It is an arithmetic number, because the mean of its divisors is an integer number (5004246753).

Almost surely, 2^16680822505 is an apocalyptic number.

It is an amenable number.

16680822505 is a deficient number, since it is larger than the sum of its proper divisors (3336164507).

16680822505 is an equidigital number, since it uses as much as digits as its factorization.

16680822505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336164506.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 16680822505 in words is "sixteen billion, six hundred eighty million, eight hundred twenty-two thousand, five hundred five".