16505555505505 has 16 divisors (see below), whose sum is σ = 22109767377984. Its totient is φ = 11724876636480.

The previous prime is 16505555505499. The next prime is 16505555505557. The reversal of 16505555505505 is 50550555550561.

It is a happy number.

It is not a de Polignac number, because 16505555505505 - 2³ = 16505555505497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3489544254 + ... + 3489548983.

It is an arithmetic number, because the mean of its divisors is an integer number (1381860461124).

Almost surely, 2^{16505555505505} is an apocalyptic number.

It is an amenable number.

16505555505505 is a deficient number, since it is larger than the sum of its proper divisors (5604211872479).

16505555505505 is a wasteful number, since it uses less digits than its factorization.

16505555505505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979093296.

The product of its (nonzero) digits is 11718750, while the sum is 52.

The spelling of 16505555505505 in words is "sixteen trillion, five hundred five billion, five hundred fifty-five million, five hundred five thousand, five hundred five".