6544261261 has 4 divisors (see below), whose sum is σ = 6548842300. Its totient is φ = 6539680224.

The previous prime is 6544261259. The next prime is 6544261271. The reversal of 6544261261 is 1621624456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4112785161 + 2431476100 = 64131^2 + 49310^2 .

It is a cyclic number.

It is not a de Polignac number, because 6544261261 - 2¹ = 6544261259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6544261261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6544261211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2288376 + ... + 2291233.

It is an arithmetic number, because the mean of its divisors is an integer number (1637210575).

Almost surely, 2^6544261261 is an apocalyptic number.

It is an amenable number.

6544261261 is a deficient number, since it is larger than the sum of its proper divisors (4581039).

6544261261 is a wasteful number, since it uses less digits than its factorization.

6544261261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4581038.

The product of its digits is 69120, while the sum is 37.

The square root of 6544261261 is about 80896.6084641377. The cubic root of 6544261261 is about 1870.4820419346.

The spelling of 6544261261 in words is "six billion, five hundred forty-four million, two hundred sixty-one thousand, two hundred sixty-one".