6645200243 has 16 divisors (see below), whose sum is σ = 7331282784. Its totient is φ = 5972904960.

The previous prime is 6645200171. The next prime is 6645200279. The reversal of 6645200243 is 3420025466.

It is not a de Polignac number, because 6645200243 - 2⁸ = 6645199987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645200143) 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, 1360121 + ... + 1364997.

It is an arithmetic number, because the mean of its divisors is an integer number (458205174).

Almost surely, 2^6645200243 is an apocalyptic number.

6645200243 is a deficient number, since it is larger than the sum of its proper divisors (686082541).

6645200243 is a wasteful number, since it uses less digits than its factorization.

6645200243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6262.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 6645200243 is about 81518.0976409533. The cubic root of 6645200243 is about 1880.0498178854.

The spelling of 6645200243 in words is "six billion, six hundred forty-five million, two hundred thousand, two hundred forty-three".