6645350261 has 16 divisors (see below), whose sum is σ = 7535073600. Its totient is φ = 5805206400.

The previous prime is 6645350227. The next prime is 6645350323. The reversal of 6645350261 is 1620535466.

It is a happy number.

6645350261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6645350261 - 2⁶ = 6645350197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645310261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17945 + ... + 116673.

It is an arithmetic number, because the mean of its divisors is an integer number (470942100).

Almost surely, 2^6645350261 is an apocalyptic number.

It is an amenable number.

6645350261 is a deficient number, since it is larger than the sum of its proper divisors (889723339).

6645350261 is a wasteful number, since it uses less digits than its factorization.

6645350261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98980.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 6645350261 is about 81519.0177872624. The cubic root of 6645350261 is about 1880.0639653994.

The spelling of 6645350261 in words is "six billion, six hundred forty-five million, three hundred fifty thousand, two hundred sixty-one".