1644853253447 has 16 divisors (see below), whose sum is σ = 1655586769920. Its totient is φ = 1634160902112.

The previous prime is 1644853253443. The next prime is 1644853253479. The reversal of 1644853253447 is 7443523584461.

It is a cyclic number.

It is not a de Polignac number, because 1644853253447 - 2² = 1644853253443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1644853253392 and 1644853253401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644853253443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167171954 + ... + 167181792.

It is an arithmetic number, because the mean of its divisors is an integer number (103474173120).

Almost surely, 2^{1644853253447} is an apocalyptic number.

1644853253447 is a deficient number, since it is larger than the sum of its proper divisors (10733516473).

1644853253447 is a wasteful number, since it uses less digits than its factorization.

1644853253447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11822.

The product of its digits is 38707200, while the sum is 56.

The spelling of 1644853253447 in words is "one trillion, six hundred forty-four billion, eight hundred fifty-three million, two hundred fifty-three thousand, four hundred forty-seven".