1644014225 has 12 divisors (see below), whose sum is σ = 2329803264. Its totient is φ = 1127323920.

The previous prime is 1644014221. The next prime is 1644014243. The reversal of 1644014225 is 5224104461.

It is not a de Polignac number, because 1644014225 - 2² = 1644014221 is a prime.

It is a super-3 number, since 3×1644014225³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1644014221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4697009 + ... + 4697358.

It is an arithmetic number, because the mean of its divisors is an integer number (194150272).

Almost surely, 2^1644014225 is an apocalyptic number.

It is an amenable number.

1644014225 is a deficient number, since it is larger than the sum of its proper divisors (685789039).

1644014225 is an equidigital number, since it uses as much as digits as its factorization.

1644014225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9394384 (or 9394379 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 1644014225 is about 40546.4452819233. The cubic root of 1644014225 is about 1180.2350927263.

Adding to 1644014225 its reverse (5224104461), we get a palindrome (6868118686).

The spelling of 1644014225 in words is "one billion, six hundred forty-four million, fourteen thousand, two hundred twenty-five".