16245163565 has 4 divisors (see below), whose sum is σ = 19494196284. Its totient is φ = 12996130848.

The previous prime is 16245163547. The next prime is 16245163573. The reversal of 16245163565 is 56536154261.

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 3355421476 + 12889742089 = 57926^2 + 113533^2 .

It is a cyclic number.

It is not a de Polignac number, because 16245163565 - 2¹⁰ = 16245162541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624516352 + ... + 1624516361.

It is an arithmetic number, because the mean of its divisors is an integer number (4873549071).

Almost surely, 2^16245163565 is an apocalyptic number.

It is an amenable number.

16245163565 is a deficient number, since it is larger than the sum of its proper divisors (3249032719).

16245163565 is an equidigital number, since it uses as much as digits as its factorization.

16245163565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249032718.

The product of its digits is 648000, while the sum is 44.

The spelling of 16245163565 in words is "sixteen billion, two hundred forty-five million, one hundred sixty-three thousand, five hundred sixty-five".