6444686473 has 2 divisors, whose sum is σ = 6444686474. Its totient is φ = 6444686472.

The previous prime is 6444686449. The next prime is 6444686491. The reversal of 6444686473 is 3746864446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4749552889 + 1695133584 = 68917^2 + 41172^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444686473 - 2¹³ = 6444678281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6444686473.

It is not a weakly prime, because it can be changed into another prime (6444486473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222343236 + 3222343237.

It is an arithmetic number, because the mean of its divisors is an integer number (3222343237).

Almost surely, 2^6444686473 is an apocalyptic number.

It is an amenable number.

6444686473 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444686473 is an equidigital number, since it uses as much as digits as its factorization.

6444686473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 52.

The square root of 6444686473 is about 80278.8046311104. The cubic root of 6444686473 is about 1860.9466866370.

The spelling of 6444686473 in words is "six billion, four hundred forty-four million, six hundred eighty-six thousand, four hundred seventy-three".