644084641111 has 8 divisors (see below), whose sum is σ = 669462124464. Its totient is φ = 619126620480.

The previous prime is 644084641099. The next prime is 644084641121. The reversal of 644084641111 is 111146480446.

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 644084641111 - 2²⁹ = 643547770199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644084641121) 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, 104862550 + ... + 104868691.

It is an arithmetic number, because the mean of its divisors is an integer number (83682765558).

Almost surely, 2^644084641111 is an apocalyptic number.

644084641111 is a deficient number, since it is larger than the sum of its proper divisors (25377483353).

644084641111 is a wasteful number, since it uses less digits than its factorization.

644084641111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209731361.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 644084641111 in words is "six hundred forty-four billion, eighty-four million, six hundred forty-one thousand, one hundred eleven".