1644303914681 has 8 divisors (see below), whose sum is σ = 1790530579200. Its totient is φ = 1504045685520.

The previous prime is 1644303914677. The next prime is 1644303914717. The reversal of 1644303914681 is 1864193034461.

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 1644303914681 - 2² = 1644303914677 is a prime.

It is a super-4 number, since 4×1644303914681⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1644303914621) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1492108265 + ... + 1492109366.

It is an arithmetic number, because the mean of its divisors is an integer number (223816322400).

Almost surely, 2^{1644303914681} is an apocalyptic number.

It is an amenable number.

1644303914681 is a deficient number, since it is larger than the sum of its proper divisors (146226664519).

1644303914681 is a wasteful number, since it uses less digits than its factorization.

1644303914681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984217679.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 1644303914681 in words is "one trillion, six hundred forty-four billion, three hundred three million, nine hundred fourteen thousand, six hundred eighty-one".