1644345055 has 8 divisors (see below), whose sum is σ = 2015197632. Its totient is φ = 1287487008.

The previous prime is 1644345047. The next prime is 1644345061. The reversal of 1644345055 is 5505434461.

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 1644345055 - 2³ = 1644345047 is a prime.

It is a super-3 number, since 3×1644345055³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3498372 + ... + 3498841.

It is an arithmetic number, because the mean of its divisors is an integer number (251899704).

Almost surely, 2^1644345055 is an apocalyptic number.

1644345055 is a deficient number, since it is larger than the sum of its proper divisors (370852577).

1644345055 is an equidigital number, since it uses as much as digits as its factorization.

1644345055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6997265.

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 1644345055 is about 40550.5247191698. The cubic root of 1644345055 is about 1180.3142548531.

The spelling of 1644345055 in words is "one billion, six hundred forty-four million, three hundred forty-five thousand, fifty-five".