216424441565 has 32 divisors (see below), whose sum is σ = 265239032544. Its totient is φ = 169482378240.

The previous prime is 216424441559. The next prime is 216424441573. The reversal of 216424441565 is 565144424612.

It can be written as a sum of positive squares in 16 ways, for example, as 180198552004 + 36225889561 = 424498^2 + 190331^2 .

It is not a de Polignac number, because 216424441565 - 2¹⁸ = 216424179421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73189067 + ... + 73192023.

It is an arithmetic number, because the mean of its divisors is an integer number (8288719767).

Almost surely, 2^216424441565 is an apocalyptic number.

It is an amenable number.

216424441565 is a deficient number, since it is larger than the sum of its proper divisors (48814590979).

216424441565 is a wasteful number, since it uses less digits than its factorization.

216424441565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4097.

The product of its digits is 921600, while the sum is 44.

The spelling of 216424441565 in words is "two hundred sixteen billion, four hundred twenty-four million, four hundred forty-one thousand, five hundred sixty-five".