644002160233 has 2 divisors, whose sum is σ = 644002160234. Its totient is φ = 644002160232.

The previous prime is 644002160227. The next prime is 644002160299. The reversal of 644002160233 is 332061200446.

644002160233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559755356224 + 84246804009 = 748168^2 + 290253^2 .

It is a cyclic number.

It is not a de Polignac number, because 644002160233 - 2¹⁷ = 644002029161 is a prime.

It is a super-2 number, since 2×644002160233² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 644002160195 and 644002160204.

It is not a weakly prime, because it can be changed into another prime (644002160213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322001080116 + 322001080117.

It is an arithmetic number, because the mean of its divisors is an integer number (322001080117).

Almost surely, 2^644002160233 is an apocalyptic number.

It is an amenable number.

644002160233 is a deficient number, since it is larger than the sum of its proper divisors (1).

644002160233 is an equidigital number, since it uses as much as digits as its factorization.

644002160233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 644002160233 its reverse (332061200446), we get a palindrome (976063360679).

The spelling of 644002160233 in words is "six hundred forty-four billion, two million, one hundred sixty thousand, two hundred thirty-three".