16500163565 has 4 divisors (see below), whose sum is σ = 19800196284. Its totient is φ = 13200130848.

The previous prime is 16500163549. The next prime is 16500163567. The reversal of 16500163565 is 56536100561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11012613481 + 5487550084 = 104941^2 + 74078^2 .

It is a cyclic number.

It is not a de Polignac number, because 16500163565 - 2⁴ = 16500163549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16500163567) 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, 1650016352 + ... + 1650016361.

It is an arithmetic number, because the mean of its divisors is an integer number (4950049071).

Almost surely, 2^16500163565 is an apocalyptic number.

It is an amenable number.

16500163565 is a deficient number, since it is larger than the sum of its proper divisors (3300032719).

16500163565 is an equidigital number, since it uses as much as digits as its factorization.

16500163565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300032718.

The product of its (nonzero) digits is 81000, while the sum is 38.

The spelling of 16500163565 in words is "sixteen billion, five hundred million, one hundred sixty-three thousand, five hundred sixty-five".