16505505516520 has 64 divisors (see below), whose sum is σ = 37366952555520. Its totient is φ = 6561394377984.

The previous prime is 16505505516491. The next prime is 16505505516557. The reversal of 16505505516520 is 2561550550561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186473394 + ... + 186561886.

It is an arithmetic number, because the mean of its divisors is an integer number (583858633680).

Almost surely, 2^{16505505516520} is an apocalyptic number.

16505505516520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16505505516520 is an abundant number, since it is smaller than the sum of its proper divisors (20861447039000).

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

16505505516520 is a wasteful number, since it uses less digits than its factorization.

16505505516520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117274 (or 117270 counting only the distinct ones).

The product of its (nonzero) digits is 1125000, while the sum is 46.

The spelling of 16505505516520 in words is "sixteen trillion, five hundred five billion, five hundred five million, five hundred sixteen thousand, five hundred twenty".