4551621521444 has 48 divisors (see below), whose sum is σ = 8192635109568. Its totient is φ = 2211689470848.

The previous prime is 4551621521441. The next prime is 4551621521459. The reversal of 4551621521444 is 4441251261554.

It is a junction number, because it is equal to n+sod(n) for n = 4551621521395 and 4551621521404.

It is not an unprimeable number, because it can be changed into a prime (4551621521441) 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, 294271799 + ... + 294287265.

It is an arithmetic number, because the mean of its divisors is an integer number (170679898116).

Almost surely, 2^{4551621521444} is an apocalyptic number.

It is an amenable number.

4551621521444 is a deficient number, since it is larger than the sum of its proper divisors (3641013588124).

4551621521444 is a wasteful number, since it uses less digits than its factorization.

4551621521444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28604 (or 28602 counting only the distinct ones).

The product of its digits is 768000, while the sum is 44.

Adding to 4551621521444 its reverse (4441251261554), we get a palindrome (8992872782998).

The spelling of 4551621521444 in words is "four trillion, five hundred fifty-one billion, six hundred twenty-one million, five hundred twenty-one thousand, four hundred forty-four".