16505656555 has 8 divisors (see below), whose sum is σ = 19859050800. Its totient is φ = 13169683296.

The previous prime is 16505656537. The next prime is 16505656567. The reversal of 16505656555 is 55565650561.

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 16505656555 - 2⁹ = 16505656043 is a prime.

It is a super-2 number, since 2×16505656555² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16505656499 and 16505656508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4353160 + ... + 4356949.

It is an arithmetic number, because the mean of its divisors is an integer number (2482381350).

Almost surely, 2^16505656555 is an apocalyptic number.

16505656555 is a deficient number, since it is larger than the sum of its proper divisors (3353394245).

16505656555 is an equidigital number, since it uses as much as digits as its factorization.

16505656555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8710493.

The product of its (nonzero) digits is 3375000, while the sum is 49.

The spelling of 16505656555 in words is "sixteen billion, five hundred five million, six hundred fifty-six thousand, five hundred fifty-five".