644031606001 has 8 divisors (see below), whose sum is σ = 736326949824. Its totient is φ = 551808969360.

The previous prime is 644031605993. The next prime is 644031606013. The reversal of 644031606001 is 100606130446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 644031606001 - 2³ = 644031605993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644031606901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18157810 + ... + 18193243.

It is an arithmetic number, because the mean of its divisors is an integer number (92040868728).

Almost surely, 2^644031606001 is an apocalyptic number.

It is an amenable number.

644031606001 is a deficient number, since it is larger than the sum of its proper divisors (92295343823).

644031606001 is a wasteful number, since it uses less digits than its factorization.

644031606001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36353591.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 644031606001 its reverse (100606130446), we get a palindrome (744637736447).

The spelling of 644031606001 in words is "six hundred forty-four billion, thirty-one million, six hundred six thousand, one".