6641225261 has 16 divisors (see below), whose sum is σ = 7434866880. Its totient is φ = 5880875520.

The previous prime is 6641225231. The next prime is 6641225291. The reversal of 6641225261 is 1625221466.

It is an interprime number because it is at equal distance from previous prime (6641225231) and next prime (6641225291).

It is a cyclic number.

It is not a de Polignac number, because 6641225261 - 2¹⁰ = 6641224237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641225221) 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, 40061 + ... + 122013.

It is an arithmetic number, because the mean of its divisors is an integer number (464679180).

Almost surely, 2^6641225261 is an apocalyptic number.

It is an amenable number.

6641225261 is a deficient number, since it is larger than the sum of its proper divisors (793641619).

6641225261 is a wasteful number, since it uses less digits than its factorization.

6641225261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82156.

The product of its digits is 34560, while the sum is 35.

The square root of 6641225261 is about 81493.7130151768. The cubic root of 6641225261 is about 1879.6748778540.

The spelling of 6641225261 in words is "six billion, six hundred forty-one million, two hundred twenty-five thousand, two hundred sixty-one".