5644216385 has 8 divisors (see below), whose sum is σ = 6801165096. Its totient is φ = 4496636160.

The previous prime is 5644216367. The next prime is 5644216433. The reversal of 5644216385 is 5836124465.

It is a Cunningham number, because it is equal to 75128²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 83978896 + 5560237489 = 9164^2 + 74567^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5644216385 - 2⁸ = 5644216129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2340794 + ... + 2343203.

It is an arithmetic number, because the mean of its divisors is an integer number (850145637).

Almost surely, 2^5644216385 is an apocalyptic number.

It is an amenable number.

5644216385 is a deficient number, since it is larger than the sum of its proper divisors (1156948711).

5644216385 is a wasteful number, since it uses less digits than its factorization.

5644216385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684243.

The product of its digits is 691200, while the sum is 44.

The square root of 5644216385 is about 75128.0000066553. Note that the first 5 decimals coincide. The cubic root of 5644216385 is about 1780.4695542994.

It can be divided in two parts, 56442 and 16385, that added together give a palindrome (72827).

The spelling of 5644216385 in words is "five billion, six hundred forty-four million, two hundred sixteen thousand, three hundred eighty-five".