144544561621 has 4 divisors (see below), whose sum is σ = 145514659500. Its totient is φ = 143574463744.

The previous prime is 144544561613. The next prime is 144544561643. The reversal of 144544561621 is 126165445441.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54295990225 + 90248571396 = 233015^2 + 300414^2 .

It is a cyclic number.

It is not a de Polignac number, because 144544561621 - 2³ = 144544561613 is a prime.

It is a super-3 number, since 3×144544561621³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144544568621) 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, 485048716 + ... + 485049013.

It is an arithmetic number, because the mean of its divisors is an integer number (36378664875).

Almost surely, 2^144544561621 is an apocalyptic number.

It is an amenable number.

144544561621 is a deficient number, since it is larger than the sum of its proper divisors (970097879).

144544561621 is an equidigital number, since it uses as much as digits as its factorization.

144544561621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970097878.

The product of its digits is 460800, while the sum is 43.

The spelling of 144544561621 in words is "one hundred forty-four billion, five hundred forty-four million, five hundred sixty-one thousand, six hundred twenty-one".