1644345300000 has 576 divisors, whose sum is σ = 5834056596480. Its totient is φ = 403100160000.

The previous prime is 1644345299983. The next prime is 1644345300019. The reversal of 1644345300000 is 35434461.

It is a super-3 number, since 3×1644345300000³ (a number of 38 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1142699281 + ... + 1142700719.

It is an arithmetic number, because the mean of its divisors is an integer number (10128570480).

Almost surely, 2^{1644345300000} is an apocalyptic number.

1644345300000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644345300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2917028298240).

1644345300000 is an abundant number, since it is smaller than the sum of its proper divisors (4189711296480).

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

1644345300000 is a wasteful number, since it uses less digits than its factorization.

1644345300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1755 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 1644345300000 in words is "one trillion, six hundred forty-four billion, three hundred forty-five million, three hundred thousand".