1644253144424 has 16 divisors (see below), whose sum is σ = 3363245068320. Its totient is φ = 747387792880.

The previous prime is 1644253144423. The next prime is 1644253144433. The reversal of 1644253144424 is 4244413524461.

It is a happy number.

It is a super-3 number, since 3×1644253144424³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (1644253144423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9342347324 + ... + 9342347499.

It is an arithmetic number, because the mean of its divisors is an integer number (210202816770).

Almost surely, 2^{1644253144424} is an apocalyptic number.

It is an amenable number.

1644253144424 is an abundant number, since it is smaller than the sum of its proper divisors (1718991923896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1644253144424 is a wasteful number, since it uses less digits than its factorization.

1644253144424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18684694840 (or 18684694836 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 44.

Adding to 1644253144424 its reverse (4244413524461), we get a palindrome (5888666668885).

The spelling of 1644253144424 in words is "one trillion, six hundred forty-four billion, two hundred fifty-three million, one hundred forty-four thousand, four hundred twenty-four".