644002160141 has 2 divisors, whose sum is σ = 644002160142. Its totient is φ = 644002160140.

The previous prime is 644002160107. The next prime is 644002160173. The reversal of 644002160141 is 141061200446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 566414286025 + 77587874116 = 752605^2 + 278546^2 .

It is a cyclic number.

It is not a de Polignac number, because 644002160141 - 2¹⁰ = 644002159117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644002160441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322001080070 + 322001080071.

It is an arithmetic number, because the mean of its divisors is an integer number (322001080071).

Almost surely, 2^644002160141 is an apocalyptic number.

It is an amenable number.

644002160141 is a deficient number, since it is larger than the sum of its proper divisors (1).

644002160141 is an equidigital number, since it uses as much as digits as its factorization.

644002160141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 644002160141 its reverse (141061200446), we get a palindrome (785063360587).

The spelling of 644002160141 in words is "six hundred forty-four billion, two million, one hundred sixty thousand, one hundred forty-one".