644022245383 has 4 divisors (see below), whose sum is σ = 702569722248. Its totient is φ = 585474768520.

The previous prime is 644022245351. The next prime is 644022245389. The reversal of 644022245383 is 383542220446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 644022245383 - 2⁵ = 644022245351 is a prime.

It is a super-2 number, since 2×644022245383² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644022245389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29273738416 + ... + 29273738437.

It is an arithmetic number, because the mean of its divisors is an integer number (175642430562).

Almost surely, 2^644022245383 is an apocalyptic number.

644022245383 is a deficient number, since it is larger than the sum of its proper divisors (58547476865).

644022245383 is a wasteful number, since it uses less digits than its factorization.

644022245383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58547476864.

The product of its (nonzero) digits is 1105920, while the sum is 43.

The spelling of 644022245383 in words is "six hundred forty-four billion, twenty-two million, two hundred forty-five thousand, three hundred eighty-three".