1644224453 has 16 divisors (see below), whose sum is σ = 1696391424. Its totient is φ = 1592873280.

The previous prime is 1644224447. The next prime is 1644224473. The reversal of 1644224453 is 3544224461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644224453 is a prime.

It is a super-3 number, since 3×1644224453³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644224443) 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, 2951651 + ... + 2952207.

It is an arithmetic number, because the mean of its divisors is an integer number (106024464).

Almost surely, 2^1644224453 is an apocalyptic number.

It is an amenable number.

1644224453 is a deficient number, since it is larger than the sum of its proper divisors (52166971).

1644224453 is a wasteful number, since it uses less digits than its factorization.

1644224453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132.

The product of its digits is 92160, while the sum is 35.

The square root of 1644224453 is about 40549.0376334630. The cubic root of 1644224453 is about 1180.2853980266.

The spelling of 1644224453 in words is "one billion, six hundred forty-four million, two hundred twenty-four thousand, four hundred fifty-three".