644033104010213 has 16 divisors (see below), whose sum is σ = 657090743232000. Its totient is φ = 631046911930992.

The previous prime is 644033104010081. The next prime is 644033104010269. The reversal of 644033104010213 is 312010401330446.

It is a cyclic number.

It is not a de Polignac number, because 644033104010213 - 2⁸ = 644033104009957 is a prime.

It is a super-2 number, since 2×644033104010213² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 644033104010213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644033104012213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1803133598 + ... + 1803490736.

It is an arithmetic number, because the mean of its divisors is an integer number (41068171452000).

Almost surely, 2^{644033104010213} is an apocalyptic number.

It is an amenable number.

644033104010213 is a deficient number, since it is larger than the sum of its proper divisors (13057639221787).

644033104010213 is a wasteful number, since it uses less digits than its factorization.

644033104010213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457064.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 644033104010213 its reverse (312010401330446), we get a palindrome (956043505340659).

The spelling of 644033104010213 in words is "six hundred forty-four trillion, thirty-three billion, one hundred four million, ten thousand, two hundred thirteen".