1645644345200 has 60 divisors (see below), whose sum is σ = 3953798140128. Its totient is φ = 658234828800.

The previous prime is 1645644345181. The next prime is 1645644345217. The reversal of 1645644345200 is 25434465461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15864704 + ... + 15968096.

Almost surely, 2^{1645644345200} is an apocalyptic number.

1645644345200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645644345200 is an abundant number, since it is smaller than the sum of its proper divisors (2308153794928).

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

1645644345200 is a wasteful number, since it uses less digits than its factorization.

1645644345200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143202 (or 143191 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 1645644345200 in words is "one trillion, six hundred forty-five billion, six hundred forty-four million, three hundred forty-five thousand, two hundred".