6544408645 has 8 divisors (see below), whose sum is σ = 7868367000. Its totient is φ = 5225475840.

The previous prime is 6544408631. The next prime is 6544408649. The reversal of 6544408645 is 5468044456.

It can be written as a sum of positive squares in 4 ways, for example, as 680218561 + 5864190084 = 26081^2 + 76578^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6544408645 - 2⁷ = 6544408517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6544408595 and 6544408604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6544408649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1253520 + ... + 1258729.

It is an arithmetic number, because the mean of its divisors is an integer number (983545875).

Almost surely, 2^6544408645 is an apocalyptic number.

It is an amenable number.

6544408645 is a deficient number, since it is larger than the sum of its proper divisors (1323958355).

6544408645 is a wasteful number, since it uses less digits than its factorization.

6544408645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512775.

The product of its (nonzero) digits is 1843200, while the sum is 46.

The square root of 6544408645 is about 80897.5193995465. The cubic root of 6544408645 is about 1870.4960836038.

The spelling of 6544408645 in words is "six billion, five hundred forty-four million, four hundred eight thousand, six hundred forty-five".