644031606002 has 8 divisors (see below), whose sum is σ = 1008049470336. Its totient is φ = 308015115892.

The previous prime is 644031605993. The next prime is 644031606013. The reversal of 644031606002 is 200606130446.

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

It is a self number, because there is not a number n which added to its sum of digits gives 644031606002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7000343498 + ... + 7000343589.

It is an arithmetic number, because the mean of its divisors is an integer number (126006183792).

Almost surely, 2^644031606002 is an apocalyptic number.

644031606002 is a deficient number, since it is larger than the sum of its proper divisors (364017864334).

644031606002 is a wasteful number, since it uses less digits than its factorization.

644031606002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14000687112.

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

Adding to 644031606002 its reverse (200606130446), we get a palindrome (844637736448).

The spelling of 644031606002 in words is "six hundred forty-four billion, thirty-one million, six hundred six thousand, two".