16516506505 has 8 divisors (see below), whose sum is σ = 19820832192. Its totient is φ = 13212522288.

The previous prime is 16516506493. The next prime is 16516506509. The reversal of 16516506505 is 50560561561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16516506505 - 2⁵ = 16516506473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16516506509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36994 + ... + 185476.

It is an arithmetic number, because the mean of its divisors is an integer number (2477604024).

Almost surely, 2^16516506505 is an apocalyptic number.

It is an amenable number.

16516506505 is a deficient number, since it is larger than the sum of its proper divisors (3304325687).

16516506505 is a wasteful number, since it uses less digits than its factorization.

16516506505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170735.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 16516506505 in words is "sixteen billion, five hundred sixteen million, five hundred six thousand, five hundred five".