6645220792673 has 2 divisors, whose sum is σ = 6645220792674. Its totient is φ = 6645220792672.

The previous prime is 6645220792663. The next prime is 6645220792781. The reversal of 6645220792673 is 3762970225466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5112717921424 + 1532502871249 = 2261132^2 + 1237943^2 .

It is a cyclic number.

It is not a de Polignac number, because 6645220792673 - 2²² = 6645216598369 is a prime.

It is not a weakly prime, because it can be changed into another prime (6645220792663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322610396336 + 3322610396337.

It is an arithmetic number, because the mean of its divisors is an integer number (3322610396337).

Almost surely, 2^{6645220792673} is an apocalyptic number.

It is an amenable number.

6645220792673 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645220792673 is an equidigital number, since it uses as much as digits as its factorization.

6645220792673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 59.

The spelling of 6645220792673 in words is "six trillion, six hundred forty-five billion, two hundred twenty million, seven hundred ninety-two thousand, six hundred seventy-three".