644222102311 has 16 divisors (see below), whose sum is σ = 685178049600. Its totient is φ = 603609366528.

The previous prime is 644222102287. The next prime is 644222102369. The reversal of 644222102311 is 113201222446.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-644222102311 is a prime.

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 644222102311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644222102011) 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, 6608935 + ... + 6705703.

It is an arithmetic number, because the mean of its divisors is an integer number (42823628100).

Almost surely, 2^644222102311 is an apocalyptic number.

644222102311 is a deficient number, since it is larger than the sum of its proper divisors (40955947289).

644222102311 is a wasteful number, since it uses less digits than its factorization.

644222102311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98538.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 644222102311 its reverse (113201222446), we get a palindrome (757423324757).

The spelling of 644222102311 in words is "six hundred forty-four billion, two hundred twenty-two million, one hundred two thousand, three hundred eleven".