644002160241 has 32 divisors (see below), whose sum is σ = 998513510400. Its totient is φ = 365081446080.

The previous prime is 644002160233. The next prime is 644002160299. The reversal of 644002160241 is 142061200446.

It is a happy number.

644002160241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644002160241 - 2³ = 644002160233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 644002160199 and 644002160208.

It is not an unprimeable number, because it can be changed into a prime (644002160141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6451206 + ... + 6550271.

It is an arithmetic number, because the mean of its divisors is an integer number (31203547200).

Almost surely, 2^644002160241 is an apocalyptic number.

It is an amenable number.

644002160241 is a deficient number, since it is larger than the sum of its proper divisors (354511350159).

644002160241 is a wasteful number, since it uses less digits than its factorization.

644002160241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13001589.

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 644002160241 its reverse (142061200446), we get a palindrome (786063360687).

The spelling of 644002160241 in words is "six hundred forty-four billion, two million, one hundred sixty thousand, two hundred forty-one".