65215638443 has 4 divisors (see below), whose sum is σ = 68051101008. Its totient is φ = 62380175880.

The previous prime is 65215638413. The next prime is 65215638473. The reversal of 65215638443 is 34483651256.

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

It is an interprime number because it is at equal distance from previous prime (65215638413) and next prime (65215638473).

It is not a de Polignac number, because 65215638443 - 2¹² = 65215634347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65215638413) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1417731248 + ... + 1417731293.

It is an arithmetic number, because the mean of its divisors is an integer number (17012775252).

Almost surely, 2^65215638443 is an apocalyptic number.

65215638443 is a deficient number, since it is larger than the sum of its proper divisors (2835462565).

65215638443 is a wasteful number, since it uses less digits than its factorization.

65215638443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835462564.

The product of its digits is 2073600, while the sum is 47.

The spelling of 65215638443 in words is "sixty-five billion, two hundred fifteen million, six hundred thirty-eight thousand, four hundred forty-three".