644611116446 has 16 divisors (see below), whose sum is σ = 1055302352640. Its totient is φ = 292870563480.

The previous prime is 644611116427. The next prime is 644611116449.

644611116446 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 644611116397 and 644611116406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644611116449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6675446 + ... + 6771321.

It is an arithmetic number, because the mean of its divisors is an integer number (65956397040).

Almost surely, 2^644611116446 is an apocalyptic number.

644611116446 is a deficient number, since it is larger than the sum of its proper divisors (410691236194).

644611116446 is a wasteful number, since it uses less digits than its factorization.

644611116446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13448959.

The product of its digits is 331776, while the sum is 44.

The spelling of 644611116446 in words is "six hundred forty-four billion, six hundred eleven million, one hundred sixteen thousand, four hundred forty-six".