16365561065 has 16 divisors (see below), whose sum is σ = 22469832192. Its totient is φ = 11209281984.

The previous prime is 16365561041. The next prime is 16365561133. The reversal of 16365561065 is 56016556361.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16365561065 - 2¹⁴ = 16365544681 is a prime.

It is a Duffinian number.

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, 235889 + ... + 297278.

It is an arithmetic number, because the mean of its divisors is an integer number (1404364512).

Almost surely, 2^16365561065 is an apocalyptic number.

It is an amenable number.

16365561065 is a deficient number, since it is larger than the sum of its proper divisors (6104271127).

16365561065 is an equidigital number, since it uses as much as digits as its factorization.

16365561065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534056.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 16365561065 in words is "sixteen billion, three hundred sixty-five million, five hundred sixty-one thousand, sixty-five".