6645503201 has 16 divisors (see below), whose sum is σ = 7268571648. Its totient is φ = 6048518400.

The previous prime is 6645503143. The next prime is 6645503203. The reversal of 6645503201 is 1023055466.

It is not a de Polignac number, because 6645503201 - 2²⁶ = 6578394337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645503203) 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, 913886 + ... + 921128.

It is an arithmetic number, because the mean of its divisors is an integer number (454285728).

Almost surely, 2^6645503201 is an apocalyptic number.

It is an amenable number.

6645503201 is a deficient number, since it is larger than the sum of its proper divisors (623068447).

6645503201 is a wasteful number, since it uses less digits than its factorization.

6645503201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9032.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 6645503201 is about 81519.9558451794. The cubic root of 6645503201 is about 1880.0783882548.

Adding to 6645503201 its reverse (1023055466), we get a palindrome (7668558667).

The spelling of 6645503201 in words is "six billion, six hundred forty-five million, five hundred three thousand, two hundred one".