6645801313 has 16 divisors (see below), whose sum is σ = 7169499216. Its totient is φ = 6137958400.

The previous prime is 6645801311. The next prime is 6645801377. The reversal of 6645801313 is 3131085466.

It can be written as a sum of positive squares in 8 ways, for example, as 17073424 + 6628727889 = 4132^2 + 81417^2 .

It is a cyclic number.

It is not a de Polignac number, because 6645801313 - 2¹ = 6645801311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6645801311) 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, 176895 + ... + 211147.

It is an arithmetic number, because the mean of its divisors is an integer number (448093701).

Almost surely, 2^6645801313 is an apocalyptic number.

It is an amenable number.

6645801313 is a deficient number, since it is larger than the sum of its proper divisors (523697903).

6645801313 is a wasteful number, since it uses less digits than its factorization.

6645801313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34484.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 6645801313 is about 81521.7842849382. The cubic root of 6645801313 is about 1880.1065007760.

Adding to 6645801313 its reverse (3131085466), we get a palindrome (9776886779).

The spelling of 6645801313 in words is "six billion, six hundred forty-five million, eight hundred one thousand, three hundred thirteen".