644346110212 has 96 divisors (see below), whose sum is σ = 1312281540864. Its totient is φ = 271131494400.

The previous prime is 644346110189. The next prime is 644346110263. The reversal of 644346110212 is 212011643446.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 684745662 + ... + 684746602.

It is an arithmetic number, because the mean of its divisors is an integer number (13669599384).

Almost surely, 2^644346110212 is an apocalyptic number.

It is an amenable number.

644346110212 is an abundant number, since it is smaller than the sum of its proper divisors (667935430652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644346110212 is a wasteful number, since it uses less digits than its factorization.

644346110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189 (or 2187 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

Adding to 644346110212 its reverse (212011643446), we get a palindrome (856357753658).

The spelling of 644346110212 in words is "six hundred forty-four billion, three hundred forty-six million, one hundred ten thousand, two hundred twelve".