6544444444457 has 4 divisors (see below), whose sum is σ = 6544932448656. Its totient is φ = 6543956440260.

The previous prime is 6544444444453. The next prime is 6544444444459. The reversal of 6544444444457 is 7544444444456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6544444444457 - 2² = 6544444444453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6544444444396 and 6544444444405.

It is not an unprimeable number, because it can be changed into a prime (6544444444453) 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, 243981983 + ... + 244008804.

It is an arithmetic number, because the mean of its divisors is an integer number (1636233112164).

Almost surely, 2^{6544444444457} is an apocalyptic number.

It is an amenable number.

6544444444457 is a deficient number, since it is larger than the sum of its proper divisors (488004199).

6544444444457 is a wasteful number, since it uses less digits than its factorization.

6544444444457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488004198.

The product of its digits is 275251200, while the sum is 59.

Subtracting 6544444444457 from its reverse (7544444444456), we obtain a palindrome (999999999999).

The spelling of 6544444444457 in words is "six trillion, five hundred forty-four billion, four hundred forty-four million, four hundred forty-four thousand, four hundred fifty-seven".