6541565261 has 16 divisors (see below), whose sum is σ = 8159699328. Its totient is φ = 5094835200.

The previous prime is 6541565197. The next prime is 6541565281. The reversal of 6541565261 is 1625651456.

It is not a de Polignac number, because 6541565261 - 2⁶ = 6541565197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541565281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146741 + ... + 186053.

It is an arithmetic number, because the mean of its divisors is an integer number (509981208).

Almost surely, 2^6541565261 is an apocalyptic number.

It is an amenable number.

6541565261 is a deficient number, since it is larger than the sum of its proper divisors (1618134067).

6541565261 is a wasteful number, since it uses less digits than its factorization.

6541565261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41492.

The product of its digits is 216000, while the sum is 41.

The square root of 6541565261 is about 80879.9435027003. The cubic root of 6541565261 is about 1870.2251495710.

The spelling of 6541565261 in words is "six billion, five hundred forty-one million, five hundred sixty-five thousand, two hundred sixty-one".