6545384918561 has 6 divisors (see below), whose sum is σ = 6572656944486. Its totient is φ = 6518225587200.

The previous prime is 6545384918531. The next prime is 6545384918591. The reversal of 6545384918561 is 1658194835456.

It is an interprime number because it is at equal distance from previous prime (6545384918531) and next prime (6545384918591).

It can be written as a sum of positive squares in 3 ways, for example, as 1722446256400 + 4822938662161 = 1312420^2 + 2196119^2 .

It is not a de Polignac number, because 6545384918561 - 2¹⁰ = 6545384917537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6545384918531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56288960 + ... + 56405121.

It is an arithmetic number, because the mean of its divisors is an integer number (1095442824081).

Almost surely, 2^{6545384918561} is an apocalyptic number.

It is an amenable number.

6545384918561 is a deficient number, since it is larger than the sum of its proper divisors (27272025925).

6545384918561 is an equidigital number, since it uses as much as digits as its factorization.

6545384918561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112694563 (or 112694322 counting only the distinct ones).

The product of its digits is 124416000, while the sum is 65.

The spelling of 6545384918561 in words is "six trillion, five hundred forty-five billion, three hundred eighty-four million, nine hundred eighteen thousand, five hundred sixty-one".