6544451540 has 48 divisors (see below), whose sum is σ = 15476396544. Its totient is φ = 2303030400.

The previous prime is 6544451491. The next prime is 6544451569. The reversal of 6544451540 is 451544456.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6544451494 and 6544451503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472979 + ... + 486618.

It is an arithmetic number, because the mean of its divisors is an integer number (322424928).

Almost surely, 2^6544451540 is an apocalyptic number.

It is an amenable number.

6544451540 is an abundant number, since it is smaller than the sum of its proper divisors (8931945004).

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

6544451540 is a wasteful number, since it uses less digits than its factorization.

6544451540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959648 (or 959646 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 38.

The square root of 6544451540 is about 80897.7845184898. The cubic root of 6544451540 is about 1870.5001702860.

Adding to 6544451540 its reverse (451544456), we get a palindrome (6995995996).

The spelling of 6544451540 in words is "six billion, five hundred forty-four million, four hundred fifty-one thousand, five hundred forty".