6645251713 has 2 divisors, whose sum is σ = 6645251714. Its totient is φ = 6645251712.

The previous prime is 6645251699. The next prime is 6645251741. The reversal of 6645251713 is 3171525466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5770985089 + 874266624 = 75967^2 + 29568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6645251713 is a prime.

It is not a weakly prime, because it can be changed into another prime (6645251773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322625856 + 3322625857.

It is an arithmetic number, because the mean of its divisors is an integer number (3322625857).

Almost surely, 2^6645251713 is an apocalyptic number.

It is an amenable number.

6645251713 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645251713 is an equidigital number, since it uses as much as digits as its factorization.

6645251713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 40.

The square root of 6645251713 is about 81518.4133371105. The cubic root of 6645251713 is about 1880.0546718106.

The spelling of 6645251713 in words is "six billion, six hundred forty-five million, two hundred fifty-one thousand, seven hundred thirteen".