16105565617 has 4 divisors (see below), whose sum is σ = 16108855360. Its totient is φ = 16102275876.

The previous prime is 16105565573. The next prime is 16105565653. The reversal of 16105565617 is 71656550161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71656550161 = 7 ⋅10236650023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16105565617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16105565317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637517 + ... + 1647322.

It is an arithmetic number, because the mean of its divisors is an integer number (4027213840).

Almost surely, 2^16105565617 is an apocalyptic number.

It is an amenable number.

16105565617 is a deficient number, since it is larger than the sum of its proper divisors (3289743).

16105565617 is an equidigital number, since it uses as much as digits as its factorization.

16105565617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289742.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 16105565617 in words is "sixteen billion, one hundred five million, five hundred sixty-five thousand, six hundred seventeen".