644045100320010 has 16 divisors (see below), whose sum is σ = 1545708240768096. Its totient is φ = 171745360085328.

The previous prime is 644045100320003. The next prime is 644045100320047. The reversal of 644045100320010 is 10023001540446.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 21468170010667 = 644045100320010 / (6 + 4 + 4 + 0 + 4 + 5 + 1 + 0 + 0 + 3 + 2 + 0 + 0 + 1 + 0).

It is a self number, because there is not a number n which added to its sum of digits gives 644045100320010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10734085005304 + ... + 10734085005363.

It is an arithmetic number, because the mean of its divisors is an integer number (96606765048006).

Almost surely, 2^{644045100320010} is an apocalyptic number.

644045100320010 is an abundant number, since it is smaller than the sum of its proper divisors (901663140448086).

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

644045100320010 is a wasteful number, since it uses less digits than its factorization.

644045100320010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21468170010677.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 644045100320010 its reverse (10023001540446), we get a palindrome (654068101860456).

The spelling of 644045100320010 in words is "six hundred forty-four trillion, forty-five billion, one hundred million, three hundred twenty thousand, ten".