1644043316216 has 16 divisors (see below), whose sum is σ = 3522949963440. Its totient is φ = 704589992640.

The previous prime is 1644043316213. The next prime is 1644043316219. The reversal of 1644043316216 is 6126133404461.

It is an interprime number because it is at equal distance from previous prime (1644043316213) and next prime (1644043316219).

It is a super-3 number, since 3×1644043316216³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644043316213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14678958125 + ... + 14678958236.

It is an arithmetic number, because the mean of its divisors is an integer number (220184372715).

Almost surely, 2^{1644043316216} is an apocalyptic number.

It is an amenable number.

1644043316216 is an abundant number, since it is smaller than the sum of its proper divisors (1878906647224).

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

1644043316216 is a wasteful number, since it uses less digits than its factorization.

1644043316216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29357916374 (or 29357916370 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 1644043316216 in words is "one trillion, six hundred forty-four billion, forty-three million, three hundred sixteen thousand, two hundred sixteen".